with_assign      => '+ - * / % ** << >> x .',
assign           => '+= -= *= /= %= **= <<= >>= x= .=',
num_comparison   => '< <= > >= == !=',
'3way_comparison'=> '<=> cmp',
str_comparison   => 'lt le gt ge eq ne',
binary           => '& &= | |= ^ ^= &. &.= |. |.= ^. ^.=',
unary            => 'neg ! ~ ~.',
mutators         => '++ --',
func             => 'atan2 cos sin exp abs log sqrt int',
conversion       => 'bool "" 0+ qr',
iterators        => '<>',
filetest         => '-X',
dereferencing    => '${} @{} %{} &{} *{}',
matching         => '~~',
special          => 'nomethod fallback ='