Boxception by tails

:0
s/[1-9]/&-/g
y/123456789/012345678/
s/0-0/9-/
t0
s/0-//
s/-*/+&-&+/
h
:1
T
G
P
s/+-+/| |/
t
s/+-/|+/g
s/-+/+|/g
b1

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

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