picket fence by tails

for a in "  _ " {,}{_,\ }{,}"| |" "''''"
{
b=${a::1}
c=$b$b$b$b$b
c+=$c$a
echo "${a:1}$c$b$c$b$c"
}

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

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