Rotate strains, so that strain 1 becomes the sum of strains 1 and 2 and strain 2 is empty. Use this to allow sequential replacement of strains.
rotate_strains(state, info, ...)
Model state
Model info
Additional arguments, ignored. This exists so that this function can be used as an argument to mcstate::multistage_epoch. Practically your two model informations in this case would be equivalent.