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4.8 ¶õÇò¹Ô°Ê³°¤ËÈÖ¹æ¤òÉÕ¤±¤ë

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#!/usr/bin/sed -nf

/^$/ {
  p
  b
}
# Same as cat -n from now
x
/^$/ s/^.*$/1/
G
h
s/^/      /
s/^ *\(......\)\n/\1  /p
x
s/\n.*$//
/^9*$/ s/^/0/
s/.9*$/x&/
h
s/^.*x//
y/0123456789/1234567890/
x
s/x.*$//
G
s/\n//
h