An afaik unnamed involution by mitchs (tails)

s/^/-/
h
y/-/a/
G
s/\n/ : /
:1
y/-/=/
s/==/-/g
s/$/AA/
T
s/=A//
T1
:
s/0\?A\{10\}/A0/
t
s/-//
T2
s/A/AA/g
b
:2
s/a/<<123456789A01>/i
s/\(.\)<.*\1\(A*.\).*>/\2/
t2
p
/480/!G
D

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