Twos in Pascals triangle by mitchs (tails)

:
/.\{127\}/!s/0\|$/ 0 /
t
h
s/\>/.12345/g
:1
s/00/\x09/g
s/\x09*0\(.\)\w*/\1/g
s/\x09\S\?/0/g
t1
p
g
s/0\{64\}\?\(0*\) /\1 \1/g
T
s/^ //
t
d

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

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