[Help-glpk] shiftcover.mod - generate different solutions

[Andreas F]

I am looking at the 'shiftcover.mod' sample in the examples directory.  I get 
the same solution every time I run it, which I suppose is expected.

However, is it possible to generate multiple, different solutions, i.e. several 
distinct, alternative work schedules that are no necessarily mathematically 
optimal?  The goal is to create more than one  work schedule, and then let the 
workers themselves choose among them.

$ glpsol -v
GLPSOL: GLPK LP/MIP Solver, v4.43

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