"1.26-stable", "f20"; (* F20 follows 1.26. *)
"1.28-stable", "f21"; (* F21 follows 1.28. *)
"1.30-stable", "f22"; (* F22 follows 1.30. *)
"1.26-stable", "f20"; (* F20 follows 1.26. *)
"1.28-stable", "f21"; (* F21 follows 1.28. *)
"1.30-stable", "f22"; (* F22 follows 1.30. *)