@loriemerson when you need to be very productive:

echo -e "1"; while $t; do for i in `seq 1 30`;do r="$[($RANDOM % 2)]";h="$[($RANDOM % 4)]";if [ $h -eq 1 ]; then v="0 $r";else v="1 $r";fi;v2="$v2 $v";done;echo -e $v2;v2="";done;