Six or more by tails

G
:
s/.\w*3[0-8]//g
y/01236789abc/1236789abc0/
/[ac]/b
s/0//
/1717/{s/.\{16\}//;q}
s/.\w*/&0&1&2&3&6&7&8&9/g
b

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

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