There is no need to stop a program when a set is declared twice as long as the definition is completely the same.
Set s: 1,2,3;
Set s: 1,2,3;
FORM 4.1 (Jun 10 2017, v4.1-20131025-355-g0bf5c58) 64-bits Run: Tue Jun 13 18:33:01 2017
test.frm Line 2 --> There is already a set with the name s
Program terminating at test.frm Line 2 -->
There is no need to stop a program when a set is declared twice as long as the definition is completely the same.