人間ningenha赤ん坊akanbounoときtokiha四つんばいyotsunbaideそれからsorekarahonnoashide歩くarukuようになりyouninari最後saigoha年をとってtoshiwotottetsuega必要hitsuyouになるninaru
It crawls on all fours as a baby, then learns to walk on two legs, and finally needs a cane in old age.

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