+notation "ℳ\sub 1 x" non associative with precedence 60 for @{'Fm1 $x}.
+notation > "ℳ_1" non associative with precedence 90 for @{Fm1 ?????}.
+interpretation "Fm1" 'Fm1 x = (Fm1 _____ x).
+
+notation "ℳ\sub 2 x" non associative with precedence 60 for @{'Fm2 $x}.
+notation > "ℳ_2" non associative with precedence 90 for @{Fm2 ?????}.
+interpretation "Fm2" 'Fm2 x = (Fm2 _____ x).
+