Title: Select a guard expression
Goal: Generalize the function `f/2' by selecting the guard expression `A > B; B > 0, A > 0; B > A', the a new parameter is `Positive'.
Parameters: [{file,"gen25.erl"},{posrange,{54,72}},{varname,"Guard"}].
Documentation: The selected guard is a conjunction. There is not any variable with the name `Positive', so it is possible to introduce a new pattern and replace this conjunction with a simple variable with the name `Positive'. An `orelse' expression (`3>0 andalso G>0 orelse 3>G') is created and added to the argument list of the function call. 
