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AlgebraFromSolution[ig, solution] gives the rparameter infinitesimal generator by combining the general form of the infinitesimal generator for the problem with the solution obtained from the SolveOverdeterminedEqs. 
the determining equations of the ode and the general form of the inifinitesimal generator are given by the command
finally, by using the AlgebraFromSolution we obtain the specific multiparameter infinitesimal generator
