Pileup by clock

y/ /-/
:
h
s/-/ /gp
g
s/\w*-[^-]*/ & /
:a
s/ \(\w\)\(\w*-\w*\)\([^-]\) /\1 \2 \3/
ta
s/- \| -//
t

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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