fact: Example commring_bimodule (R : commring) : bimodule R R.
imports: UniMath.Algebra.Modules.Core UniMath.Algebra.Modules.Multimodules UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.Algebra.RigsAndRings UniMath.Foundations.Preamble UniMath.MoreFoundations.Tactics