A005836 by tails

G
:
s/.\w*/&0&1&2&3&4&5&6&7&8&9/g
/.000/!b
s//0/
:1
s/\n\(\w*.\)\w*\n*/_\1/g
t1
s/_0*/\n/g

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

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