The symbol 'almost equal to' has been removed since it is now normally included in the base 'Compose' file.
<Multi_key> <3> <v> : "∛" U221B # cube root
<Multi_key> <v> <4> : "∜" U221C # fourth root
<Multi_key> <4> <v> : "∜" U221C # fourth root
-<Multi_key> <asciitilde> <asciitilde> : "≈" U2248 # almost equal to
<Multi_key> <3> <v> : "∛" U221B # cube root
<Multi_key> <v> <4> : "∜" U221C # fourth root
<Multi_key> <4> <v> : "∜" U221C # fourth root
-<Multi_key> <asciitilde> <asciitilde> : "≈" U2248 # almost equal to