A069800 by tails

:0
s/$/!/
:
h
s/!/7654321;/g
s/\(.\)\{7\}\w*;/\1/gp
/2221/Q
g
T
s/\(!\(x\)\|x\)\(x*\)\(!*\)!$/\2!\4\3!/
t
y/!/x/
b0

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