https://leanprover-community.github.io/mathlib4_docs/Init/GrindInstances/Ring/BitVec.html
Init.GrindInstances.Ring.BitVec
initringbitvec
https://leanprover-community.github.io/mathlib4_docs/Init/GrindInstances/Nat.html
Init.GrindInstances.Nat
initnat
https://leanprover-community.github.io/mathlib4_docs/Init/GrindInstances/Ring/Nat.html
Init.GrindInstances.Ring.Nat
initringnat
https://leanprover-community.github.io/mathlib4_docs/Init/GrindInstances/Ring.html
Init.GrindInstances.Ring
initring