c=25;
for i in {1..25};
do temp=$c;
while [ $temp -gt 0 ];
do printf " ";
temp=$(( temp - 1 ));
done;
j=$i;
if [ $j -eq 1 ];
then printf "*";
else v=$(( j * 2 ));
while [ $v -gt 0 ];
do printf "*";
v=$(( v - 1 ));
done;
fi;
c=$(( c - 1 ));
printf "\n";
done;
v=1;a=25;
while [ $a -gt 0 ];
do j=$(( 25 - a ));
while [ $j -ge 0 ];
do printf " ";
j=$(( j - 1 ));
done; t=$(( a * 2 ));
while [ $t -gt 0 ] ;
do printf "*";
t=$(( t - 1));
done;
a=$(( a - 1 ));
if [ $a -eq -1 ] ;
then printf "*";
fi;
printf "\n";
done;
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