úÎ÷FNone3!A simple untyped lambda calculus.A variable name.!Encloses a symbol in parentheses.6An atom is a variable or an expression in parentheses.Parsers a list of applications.%An expression of our lambda calculus.           syntax-example-0.2.0.0MainmainASTnameparensatomappsexprAbsAppVar_Var_App_Abs