úÎ(Á     NoneThe . function returns a length of an expression. The  f function transforms an expression to a combinator which binds specified variable when it is applied.          combinator-interactive-0.1Data.CombinatorExprVarSKI:$lengthisPrimsubstbindeeapplyevalunlambdaParserccParservariablelambda stringLitintLitccshowCC ccExpression churchNumeral encodeInt decodeInt _Combinator $fMonadExpr $fLiftExpr