<fun defs> → {<fun def>}+ 
<fun def> → "(" "define" <fun header> <exp> ")" 
<fun header> → "(" <fun name> <parameter list> ")" 
<fun name> → <id> 
<parameter list> → {<id>} 
<exp> → <id> | <int> | <float> | <floatE> | <list exp> 
<list exp> → "(" <list exp inside> ")" 
<list exp inside> → "if" <exp> <exp> <exp> | "cond" <cases> | <fun op> { <exp> } 
<cases> → {<case exp>}+ 
<case exp> → "(" ( "else" | <exp> ) <exp> ")" 
<fun op> → <id> | <arith op> | <bool op> | <comp op> 
<arith op> → + | − | * | / 
<bool op> → "and" | "or" | "not" 
<comp op> → "<" | "<=" | ">" | ">=" | "=" 

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