Number of Stored Solutions in JSPRIT

jsprit
1

As we observe that Jsprit maintains a collection of VehicleRoutingProblemSolution which is found from VehicleRoutingAlgorithm.searchSolution().

I found that number of solutions to be two.
Is there a specific reason for this number?
What would happen if we increase the number of stored solutions ?

2

Best ever is always stored. Usually, both solutions are the same.

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3

If we are able to store more VehicleRoutingProblemSolution (with the help of SolutionAcceptor) then which solution gets ruined in Ruin process out of many solution stored? is the choosing of solution random?