;;; (yiwwdn) by Zelah
 
(defmacro fn1 (exp) (list 'function (list 'lambda (list 'x)  exp)))
 
(defmacro pr (&rest args) (cons 'prnt args))
 
(defmacro prnt (exp &rest j) (list 'progn (list 'terpri) (list 'princ "--------------------") (list 'terpri) (list 'elist (list 'quote exp)) (list 'terpri) (list 'princ "-------result-------") (list 'terpri) (list 'elist exp) (list 'terpri)))
 
(defmacro prn (exp j) (list 'if (list 'funcall (list 'n==== exp) (list 'quote j)) (list 'progn (list 'prnt exp) (list 'princ "------expected------") (list 'terpri) (list 'elist (list 'quote j)) (list 'terpri))))
 
;;;
 
(defparameter *delimiter* ",")
 
(defparameter *spaces* " ")
 
(defun elist (exp) (if (listp exp) (let ((sp *spaces*)) (princ "(") (princ sp) (loop for e in exp do (funcall #'(lambda (x) (progn (write x) (princ sp) (princ *delimiter*) (princ sp))) e)) (princ ")")) (write exp)))
 
;;;
 
(terpri)
 
;;;
 
(defun odd (fn) (fn1 (if x (funcall fn x))))
 
(defun pred (fn) (fn1 (if (funcall fn x) (or x t))))
 
(defun less (y) (fn1 (if (< x y) x)))
 
(defun more (y) (fn1 (if (> x y) x)))
 
(defun == (y) (fn1 (if (eq x y) x)))
 
(defun === (y) (fn1 (if (eql x y) x)))
 
(defun ==== (y) (fn1 (if (equal x y) x)))
 
(defun y= (y) (fn1 (if (= x y) x)))
 
(defun n= (y) (fn1 (if (not (= x y)) x)))
 
(defun n== (y) (fn1 (if (not (eq x y)) x)))
 
(defun n=== (y) (fn1 (if (not (eql x y)) x)))
 
(defun n==== (y) (fn1 (if (not (equal x y)) x)))
 
(defun make-adder (n) (fn1 (if (numberp x) (+ x n))))
 
;;;
 
(defun predor (pred &rest preds) (labels ((predor (xs preds) (if preds (or (apply (car preds) xs) (predor xs (cdr preds))) ()))) (lambda (x &rest s) (let ((xs (cons x s))) (or (apply pred xs) (predor xs preds))))))
 
(defun predand (pred &rest preds) (labels ((predand (xs preds) (if preds (and (apply (car preds) xs) (predand xs (cdr preds))) (or (car xs) t)))) #'(lambda (x &rest s) (let ((xs (cons x s))) (if (apply pred xs) (predand xs preds))))))
 
(defun predfn (fn &rest preds) #'(lambda (x &rest s) (let ((xs (cons x s))) (if (apply (apply #'predand preds) xs) (apply fn xs)))))
 
(defun fnfn (fn &rest fnfn) (labels ((fnfn (x fnfn) (if fnfn (fnfn (funcall (car fnfn) x) (cdr fnfn)) x))) #'(lambda (x &rest s) (fnfn (apply fn (cons x s)) fnfn))))
 
(defun shorter (x y) (labels ((len (x) (if (numberp x) x (length x)))(compare (x y) (and (consp y) (or (not x) (compare (cdr y) (cdr x)))))) (values (if (if (if (listp x) (listp y)) (compare x y) (< (len x) (len y))) (or x t)) y x)))
 
(defun typefn (fn &rest preds)
(fn1 (or (funcall (predfn fn (apply #'predand preds)) x) x)))
 
(defun mapped (fn) (lambda (x &rest s) (if s (mapcar fn (cons x s)) (funcall fn x))))
 
(defun tree-mapped (fn) (labels ((tree-map (x &rest s)  (if s (mapcar #'tree-map (cons x s)) (if (consp x) (mapcar #'tree-map x) (funcall fn x))))) #'(lambda (x &rest s) (apply #'tree-map (cons x s)))))
 
(defun 2x () "never used")
 
(setf (symbol-function '2x) (fn1 (* 2 x)))
 
(setf (symbol-function '2x) (typefn #'2x #'numberp))
 
(setf (symbol-function '2x) (tree-mapped #'2x))
 
(defun find-if-values (fn lst) (if lst (if (funcall fn (car lst)) (values (car lst) lst) (find-if-values fn (cdr lst)))))
 
;;;
 
;;;
 
(defun last1 (lst) (car (last lst)))
 
(setf (symbol-function 'last1) (mapped #'last1))
 
(defun single (lst) (and (consp lst) (not (cdr lst)) lst))
 
(setf (symbol-function 'single) (mapped #'single))
 
(defun append1 (lst obj) (append lst (list obj)))
 
(defun conc1 (lst obj) (nconc lst (list obj)))
 
(defun mklist (obj) (if (listp obj) obj (list obj)))
 
(setf (symbol-function 'mklist) (mapped #'mklist))
 
(defun longer (x y) (labels ((len (x) (if (numberp x) x (length x)))(compare (x y) (and (consp x) (or (not y) (compare (cdr x) (cdr y)))))) (values (if (if (if (listp x) (listp y)) (compare x y) (> (len x) (len y))) x) y x)))
 
(defun filter (fn lst) (labels ((fi (fn lst acc) (if lst (let ((val (funcall fn (car lst)))) (if val (fi fn (cdr lst) (cons val acc)) (fi fn (cdr lst) acc))) (reverse acc)))) (fi fn lst ())))
 
(defun group (source n) (labels ((rec (source acc) (let ((rest (nthcdr n source))) (if (consp rest) (rec rest (cons (subseq source 0 n) acc)) (reverse (cons source acc)))))) (if (= 0 n) (error "zero length")) (if source (rec source ()))))
 
(defun flatten (x) (labels ((rec (x acc) (if x (if (atom x) (cons x acc) (rec (car x) (rec (cdr x) acc))) acc))) (rec x ())))
 
(setf (symbol-function 'flatten) (mapped #'flatten))
 
(defun prune (test tree) (labels ((rec (tree acc) (if tree (if (consp (car tree)) (rec (cdr tree) (cons (rec (car tree) ()) acc)) (rec (cdr tree) (if (funcall test (car tree)) acc (cons (car tree) acc)))) (reverse acc)))) (rec tree ())))
 
(defun find2 (fn lst) (if lst (let ((val (funcall fn (car lst)))) (if val (values (car lst) val) (find2 fn (cdr lst)))) lst))
 
(defun before (x y lst &key (test #'==)) (if lst (let ((first (car lst))) (if (funcall (funcall test y) first) () (if (funcall (funcall test x) first) lst (before x y (cdr lst) :test test))))))
 
;;;
;;;
;;;
;;;
;;;
;;;
;;;
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;;;
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;;;
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;;;
 
(defparameter nine '(
-4 -3 -2 -1 0 1 2 3 4
))
 
(defparameter het '(
t () 1 "two"
))
 
(defparameter love '(
(i) (think i) (love) (you)
))
 
(defparameter tree '(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))
 
(defparameter e '(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))
 
(pr nine
(
-4 -3 -2 -1 0 1 2 3 4
))
 
(pr het
(
t () 1 "two"
))
 
(pr love
(
(i) (think i) (love) (you)
))
 
(pr tree
(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))
 
(pr e
(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))
 
(pr 42
42
)
 
(pr (list 42) 
(
42
))
 
(pr (list (list 42))
(
(42)
))
 
(pr (2x 2)
4
)
 
(pr (2x 1 2 3 4)
(
2 4 6 8
))
 
(pr (conc1 (list 1 2) 3)
(
1 2 3
))
 
(pr nine
(
-4 -3 -2 -1 0 1 2 3 4
))
 
(pr (mapcar #'2x nine)
(
-8 -6 -4 -2 0 2 4 6 8
))
 
(pr (apply #'2x nine)
(
-8 -6 -4 -2 0 2 4 6 8
))
 
(pr (mapcar #'oddp nine)
(
() t () t () t () t ()
))
 
(pr (mapcar (less 0) nine)
(
-4 -3 -2 -1 () () () () ()
))
 
(pr (mapcar (more 0) nine)
(
() () () () () 1 2 3 4
))
 
(pr (mapcar (y= 0) nine)
(
() () () () 0 () () () ()
))
 
(pr (mapcar (n= 0) nine)
(
-4 -3 -2 -1 () 1 2 3 4
))
 
(pr (mapcar (make-adder 10) nine)
(
6 7 8 9 10 11 12 13 14
))
 
(pr (mapcar (make-adder -10) nine)
(
-14 -13 -12 -11 -10 -9 -8 -7 -6
))
 
(pr (mapcar (predor (predand (less 0) #'oddp) (predand (more 0) #'evenp)) nine)
(
() -3 () -1 () () 2 () 4
))
 
(pr (mapcar (predfn (fnfn #'2x (make-adder 10) #'-) (predor (more 2) (less -1)) #'oddp) nine)
(
() -4 () () () () () -16 ()
))
 
(pr (nthcdr 5 nine)
(
1 2 3 4
))
 
(pr (subseq nine 5 8)
(
1 2 3
))
 
(pr (last1 nine)
4
)
 
(pr (filter (predfn (fnfn #'car (make-adder -4)) #'single) (group nine 2))
(
0
))
 
(pr (multiple-value-bind (itm prd) (find2 #'oddp nine) (list itm prd)) 
(
-3 t
))
 
(pr (multiple-value-bind (itm prd) (find2 (more 4) nine) (list itm prd))
(
() ()
))
 
(pr het
(
t () 1 "two"
))
 
(pr (find-if-values #'not het)
()
)
 
(pr (multiple-value-bind (itm lst) (find-if-values #'not het) lst)
(
() 1 "two"
))
 
(pr (mapcar #'mklist het)
(
(t) () (1) ("two")
))
 
(pr (longer het "hat")
(
t () 1 "two"
))
 
(pr (multiple-value-bind (a b c) (shorter () het) (list a b c))
(
t (t () 1 "two") ()
))
 
(pr (longer het 3)
(
t () 1 "two"
))
 
(pr love
(
(i) (think i) (love) (you)
))
 
(pr (apply #'append (mapcar #'single love))
(
i love you
))
 
(pr (append1 love '!)
(
(i) (think i) (love) (you) !
))
 
(pr tree
(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))
 
(pr (flatten tree)
(
2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 i think i love you t 1 "two" -4 -3 -2 -1 0 1 2 3 4
))
 
(pr (prune (predand #'numberp #'oddp) tree)
(
((() 2) (4) (6)) ((8) (8) (6)) ((4) (2) ((i) (think i))) (((love) (you)) (t ()) ("two")) ((-4) (-2) (0)) ((2) (4))
))
 
(pr (2x tree)
(
((() 4) (6 8) (10 12)) ((14 16) (18 16) (14 12)) ((10 8) (6 4) ((i) (think i))) (((love) (you)) (t ()) (2 "two")) ((-8 -6) (-4 -2) (0 2)) ((4 6) (8))
))
 
(pr (2x (funcall (tree-mapped (typefn #'list #'numberp (less 0))) (apply #'flatten tree)))
(
(4 6 8 10 12) (14 16 18 16 14 12) (10 8 6 4 i think i) (love you t 2 "two") ((-8) (-6) (-4) (-2) 0 2) (4 6 8)
))
 
(pr e
(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))
 
(pr (before 5 4 e :test #'y=)
()
)
 
(pr (before 4 5 e :test #'y=)
(
4 3 3 4 1 2 2 7 5 1 2 1 2 3
))
 
(pr (before 3 7 e :test #'more)
(
4 3 3 4 1 2 2 7 5 1 2 1 2 3
))
 
(pr (list het nine)
(
(t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))
 
(pr (longer het nine)
()
)
 
(pr (multiple-value-bind (a b c) (longer het nine) (list a b c))
(
() (-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two")
))
 
(pr (multiple-value-bind (a b c) (longer nine het) (list a b c))
(
(-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))
 
(pr (multiple-value-bind (a b c) (shorter het nine) (list a b c))
(
(t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two")
))
 
(pr (multiple-value-bind (a b c) (shorter nine het) (list a b c))
(
() (t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))
 
(pr (last1 het nine)
(
"two" 4
))
 
;;;;;;;;;pay attention;;;;
 
;;;;;;;;;pay attention;;;;
 
;;;
 
;;;
 
(terpri) (terpri)

;;; (yiwwdn) by Zelah

(defmacro fn1 (exp) (list 'function (list 'lambda (list 'x)  exp)))

(defmacro pr (&rest args) (cons 'prnt args))

(defmacro prnt (exp &rest j) (list 'progn (list 'terpri) (list 'princ "--------------------") (list 'terpri) (list 'elist (list 'quote exp)) (list 'terpri) (list 'princ "-------result-------") (list 'terpri) (list 'elist exp) (list 'terpri)))

(defmacro prn (exp j) (list 'if (list 'funcall (list 'n==== exp) (list 'quote j)) (list 'progn (list 'prnt exp) (list 'princ "------expected------") (list 'terpri) (list 'elist (list 'quote j)) (list 'terpri))))

;;;

(defparameter *delimiter* ",")

(defparameter *spaces* " ")

(defun elist (exp) (if (listp exp) (let ((sp *spaces*)) (princ "(") (princ sp) (loop for e in exp do (funcall #'(lambda (x) (progn (write x) (princ sp) (princ *delimiter*) (princ sp))) e)) (princ ")")) (write exp)))

;;;

(terpri)

;;;

(defun odd (fn) (fn1 (if x (funcall fn x))))

(defun pred (fn) (fn1 (if (funcall fn x) (or x t))))

(defun less (y) (fn1 (if (< x y) x)))

(defun more (y) (fn1 (if (> x y) x)))

(defun == (y) (fn1 (if (eq x y) x)))

(defun === (y) (fn1 (if (eql x y) x)))

(defun ==== (y) (fn1 (if (equal x y) x)))

(defun y= (y) (fn1 (if (= x y) x)))

(defun n= (y) (fn1 (if (not (= x y)) x)))

(defun n== (y) (fn1 (if (not (eq x y)) x)))

(defun n=== (y) (fn1 (if (not (eql x y)) x)))

(defun n==== (y) (fn1 (if (not (equal x y)) x)))

(defun make-adder (n) (fn1 (if (numberp x) (+ x n))))

;;;

(defun predor (pred &rest preds) (labels ((predor (xs preds) (if preds (or (apply (car preds) xs) (predor xs (cdr preds))) ()))) (lambda (x &rest s) (let ((xs (cons x s))) (or (apply pred xs) (predor xs preds))))))

(defun predand (pred &rest preds) (labels ((predand (xs preds) (if preds (and (apply (car preds) xs) (predand xs (cdr preds))) (or (car xs) t)))) #'(lambda (x &rest s) (let ((xs (cons x s))) (if (apply pred xs) (predand xs preds))))))

(defun predfn (fn &rest preds) #'(lambda (x &rest s) (let ((xs (cons x s))) (if (apply (apply #'predand preds) xs) (apply fn xs)))))

(defun fnfn (fn &rest fnfn) (labels ((fnfn (x fnfn) (if fnfn (fnfn (funcall (car fnfn) x) (cdr fnfn)) x))) #'(lambda (x &rest s) (fnfn (apply fn (cons x s)) fnfn))))

(defun shorter (x y) (labels ((len (x) (if (numberp x) x (length x)))(compare (x y) (and (consp y) (or (not x) (compare (cdr y) (cdr x)))))) (values (if (if (if (listp x) (listp y)) (compare x y) (< (len x) (len y))) (or x t)) y x)))

(defun typefn (fn &rest preds)
(fn1 (or (funcall (predfn fn (apply #'predand preds)) x) x)))

(defun mapped (fn) (lambda (x &rest s) (if s (mapcar fn (cons x s)) (funcall fn x))))

(defun tree-mapped (fn) (labels ((tree-map (x &rest s)  (if s (mapcar #'tree-map (cons x s)) (if (consp x) (mapcar #'tree-map x) (funcall fn x))))) #'(lambda (x &rest s) (apply #'tree-map (cons x s)))))

(defun 2x () "never used")

(setf (symbol-function '2x) (fn1 (* 2 x)))

(setf (symbol-function '2x) (typefn #'2x #'numberp))

(setf (symbol-function '2x) (tree-mapped #'2x))

(defun find-if-values (fn lst) (if lst (if (funcall fn (car lst)) (values (car lst) lst) (find-if-values fn (cdr lst)))))

;;;

;;;

(defun last1 (lst) (car (last lst)))

(setf (symbol-function 'last1) (mapped #'last1))

(defun single (lst) (and (consp lst) (not (cdr lst)) lst))

(setf (symbol-function 'single) (mapped #'single))

(defun append1 (lst obj) (append lst (list obj)))

(defun conc1 (lst obj) (nconc lst (list obj)))

(defun mklist (obj) (if (listp obj) obj (list obj)))

(setf (symbol-function 'mklist) (mapped #'mklist))

(defun longer (x y) (labels ((len (x) (if (numberp x) x (length x)))(compare (x y) (and (consp x) (or (not y) (compare (cdr x) (cdr y)))))) (values (if (if (if (listp x) (listp y)) (compare x y) (> (len x) (len y))) x) y x)))

(defun filter (fn lst) (labels ((fi (fn lst acc) (if lst (let ((val (funcall fn (car lst)))) (if val (fi fn (cdr lst) (cons val acc)) (fi fn (cdr lst) acc))) (reverse acc)))) (fi fn lst ())))

(defun group (source n) (labels ((rec (source acc) (let ((rest (nthcdr n source))) (if (consp rest) (rec rest (cons (subseq source 0 n) acc)) (reverse (cons source acc)))))) (if (= 0 n) (error "zero length")) (if source (rec source ()))))

(defun flatten (x) (labels ((rec (x acc) (if x (if (atom x) (cons x acc) (rec (car x) (rec (cdr x) acc))) acc))) (rec x ())))

(setf (symbol-function 'flatten) (mapped #'flatten))

(defun prune (test tree) (labels ((rec (tree acc) (if tree (if (consp (car tree)) (rec (cdr tree) (cons (rec (car tree) ()) acc)) (rec (cdr tree) (if (funcall test (car tree)) acc (cons (car tree) acc)))) (reverse acc)))) (rec tree ())))

(defun find2 (fn lst) (if lst (let ((val (funcall fn (car lst)))) (if val (values (car lst) val) (find2 fn (cdr lst)))) lst))

(defun before (x y lst &key (test #'==)) (if lst (let ((first (car lst))) (if (funcall (funcall test y) first) () (if (funcall (funcall test x) first) lst (before x y (cdr lst) :test test))))))

;;;
;;;
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;;;
;;;
;;;
;;;
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;;;
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;;;
;;;
;;;

(defparameter nine '(
-4 -3 -2 -1 0 1 2 3 4
))

(defparameter het '(
t () 1 "two"
))

(defparameter love '(
(i) (think i) (love) (you)
))

(defparameter tree '(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))

(defparameter e '(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))

(pr nine
(
-4 -3 -2 -1 0 1 2 3 4
))

(pr het
(
t () 1 "two"
))

(pr love
(
(i) (think i) (love) (you)
))

(pr tree
(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))

(pr e
(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))

(pr 42
42
)

(pr (list 42) 
(
42
))

(pr (list (list 42))
(
(42)
))

(pr (2x 2)
4
)

(pr (2x 1 2 3 4)
(
2 4 6 8
))

(pr (conc1 (list 1 2) 3)
(
1 2 3
))

(pr nine
(
-4 -3 -2 -1 0 1 2 3 4
))

(pr (mapcar #'2x nine)
(
-8 -6 -4 -2 0 2 4 6 8
))

(pr (apply #'2x nine)
(
-8 -6 -4 -2 0 2 4 6 8
))

(pr (mapcar #'oddp nine)
(
() t () t () t () t ()
))

(pr (mapcar (less 0) nine)
(
-4 -3 -2 -1 () () () () ()
))

(pr (mapcar (more 0) nine)
(
() () () () () 1 2 3 4
))

(pr (mapcar (y= 0) nine)
(
() () () () 0 () () () ()
))

(pr (mapcar (n= 0) nine)
(
-4 -3 -2 -1 () 1 2 3 4
))

(pr (mapcar (make-adder 10) nine)
(
6 7 8 9 10 11 12 13 14
))

(pr (mapcar (make-adder -10) nine)
(
-14 -13 -12 -11 -10 -9 -8 -7 -6
))

(pr (mapcar (predor (predand (less 0) #'oddp) (predand (more 0) #'evenp)) nine)
(
() -3 () -1 () () 2 () 4
))

(pr (mapcar (predfn (fnfn #'2x (make-adder 10) #'-) (predor (more 2) (less -1)) #'oddp) nine)
(
() -4 () () () () () -16 ()
))

(pr (nthcdr 5 nine)
(
1 2 3 4
))

(pr (subseq nine 5 8)
(
1 2 3
))

(pr (last1 nine)
4
)

(pr (filter (predfn (fnfn #'car (make-adder -4)) #'single) (group nine 2))
(
0
))

(pr (multiple-value-bind (itm prd) (find2 #'oddp nine) (list itm prd)) 
(
-3 t
))

(pr (multiple-value-bind (itm prd) (find2 (more 4) nine) (list itm prd))
(
() ()
))

(pr het
(
t () 1 "two"
))

(pr (find-if-values #'not het)
()
)

(pr (multiple-value-bind (itm lst) (find-if-values #'not het) lst)
(
() 1 "two"
))

(pr (mapcar #'mklist het)
(
(t) () (1) ("two")
))

(pr (longer het "hat")
(
t () 1 "two"
))

(pr (multiple-value-bind (a b c) (shorter () het) (list a b c))
(
t (t () 1 "two") ()
))

(pr (longer het 3)
(
t () 1 "two"
))

(pr love
(
(i) (think i) (love) (you)
))

(pr (apply #'append (mapcar #'single love))
(
i love you
))

(pr (append1 love '!)
(
(i) (think i) (love) (you) !
))

(pr tree
(
((() 2) (3 4) (5 6)) ((7 8) (9 8) (7 6)) ((5 4) (3 2) ((i) (think i))) (((love) (you)) (t ()) (1 "two")) ((-4 -3) (-2 -1) (0 1)) ((2 3) (4))
))

(pr (flatten tree)
(
2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 i think i love you t 1 "two" -4 -3 -2 -1 0 1 2 3 4
))

(pr (prune (predand #'numberp #'oddp) tree)
(
((() 2) (4) (6)) ((8) (8) (6)) ((4) (2) ((i) (think i))) (((love) (you)) (t ()) ("two")) ((-4) (-2) (0)) ((2) (4))
))

(pr (2x tree)
(
((() 4) (6 8) (10 12)) ((14 16) (18 16) (14 12)) ((10 8) (6 4) ((i) (think i))) (((love) (you)) (t ()) (2 "two")) ((-8 -6) (-4 -2) (0 2)) ((4 6) (8))
))

(pr (2x (funcall (tree-mapped (typefn #'list #'numberp (less 0))) (apply #'flatten tree)))
(
(4 6 8 10 12) (14 16 18 16 14 12) (10 8 6 4 i think i) (love you t 2 "two") ((-8) (-6) (-4) (-2) 0 2) (4 6 8)
))

(pr e
(
2 1 4 3 3 4 1 2 2 7 5 1 2 1 2 3
))

(pr (before 5 4 e :test #'y=)
()
)

(pr (before 4 5 e :test #'y=)
(
4 3 3 4 1 2 2 7 5 1 2 1 2 3
))

(pr (before 3 7 e :test #'more)
(
4 3 3 4 1 2 2 7 5 1 2 1 2 3
))

(pr (list het nine)
(
(t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))

(pr (longer het nine)
()
)

(pr (multiple-value-bind (a b c) (longer het nine) (list a b c))
(
() (-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two")
))

(pr (multiple-value-bind (a b c) (longer nine het) (list a b c))
(
(-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))

(pr (multiple-value-bind (a b c) (shorter het nine) (list a b c))
(
(t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4) (t () 1 "two")
))

(pr (multiple-value-bind (a b c) (shorter nine het) (list a b c))
(
() (t () 1 "two") (-4 -3 -2 -1 0 1 2 3 4)
))

(pr (last1 het nine)
(
"two" 4
))

;;;;;;;;;pay attention;;;;

;;;;;;;;;pay attention;;;;

;;;

;;;

(terpri) (terpri)