for card in $(seq 0 9); do
x=$(((seed * 2 + card / 5) * w))
y=$(((card % 5) * h))
argz="$argz $(printf "%s/%02d%s.png" "$fold" "$((seed * 10 + card))" "$sfx") -geometry +${x}+${y} -composite "
for card in $(seq 0 9); do
x=$(((seed * 2 + card / 5) * w))
y=$(((card % 5) * h))
argz="$argz $(printf "%s/%02d%s.png" "$fold" "$((seed * 10 + card))" "$sfx") -geometry +${x}+${y} -composite "