:;S="'";D='"';B='`';Z=` expr 0 + 1`;G='echo ":;S=$D$S$D;D=$S$D$S;B=$S$B$S;Z=$B expr $Z + 1$B;G=$S$G$S";echo $G'
echo ":;S=$D$S$D;D=$S$D$S;B=$S$B$S;Z=$B expr $Z + 1$B;G=$S$G$S";echo $G