mysterious parentheses by tails

e='())'
read a b&&{
for((;l=${#a};)){
d=
for((c=i=0;i<l;c&=1)){
d+=$[c*5+(c=${a:i++:1})/2]
}
a=${d#0}
printf \(
b=${e:2*!c}$b
}
echo $b
. *
}

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