123,21:21:21 21-21-4321
4312
12.12
231ACDFE21
21cba4321
asd=
asd123asd
below is the case for forward lexer uniqueVariable
1234-a12S34d5678-12-1212-12-12-123
below is the case for reverse lexer uniqueVariable
321-21-21-2121-21-8765d43S21a-4321