Human being.
Infant crawls on "all fours".
Adult walks on two legs.
Elderly adds a cane.
Chat with our AI personalities
A Human
an old man because when it is a baby it walks on 4 legs than it grows up and walks on 2 legs than he gets old an walks on 2 legs and than uses a walking stick so that adds up to 3.
3
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2/3, 3/4, 2/4