 +Parameters >> +Lambda
+Parameters >> +Lambdacall(Lambda,A1,...), 
but arguments are reordered according to the list Parameters:
length(Parameters) arguments from A1, 
... are unified with (a copy of) Parameters, which may 
share them with variables in Lambda.| Parameters | is either a plain list of 
parameters or a term {Free}/List. Free represents variables that are 
shared between the context and the Lambda term. This is 
needed for compiling Lambda expressions. |