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  1. del(i,il,il).
  2. del(1,_,[]):-!.
  3. del(Num,[X|T],[X|T1]):- Num > 0, N1 is int(N+1), del(N,T,T1).
  4. ?- del(5,[4,11,-5,8,2,3,9,-5,2,10],L),write(L).
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
prog.pl:3: warning: singleton variables [N1] for del/3
prog.pl:4:4: syntax error: . or operator expected after expression
	1 error(s)
compilation failed
stdout
Standard output is empty