《北史·列传·卷八十六》
没有文记，将帅用羊屎粗略统计兵数，后来略微懂得刻木为记。
无文记，将帅以羊屎粗讨兵数，后颇知刻木为记。
Without written records, the generals and commanders used sheep droppings to make rough estimates of the number of soldiers. Later, they learned to carve wood to record things.