Added some utility methods for generating combinations
Added some utility methods for generating combinations

luisenp/mdp-lib,sandysa/mdp-lib,luisenp/mdp-lib,sandysa/mdp-lib,luisenp/mdp-lib,luisenp/mdp-lib,sandysa/mdp-lib,luisenp/mdp-lib,sandysa/mdp-lib,sandysa/mdp-lib