-:"$<\n"$<\n
m\n.*:"\n"
m(.)(.*\n)\|(.*):"$1"m$2$3
m.(.*\n)(.)(.*):"$2"m$1$3
(.*?\n.*?\n)(.*):$($(m$1))$2
(.)-(.)(.*):"$2 $1"$3
(.)(.*):"$1"$2
.*:"$&"