Fix the grammatical mistakes: Since the birth of human beings, our ancestors have gone through the 4 stages of life, namely birth, old, ill and death.
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The first stage of life is the birth. The second stage is the infancy, the third stage is the childhood, the fourth stage is the adolescence, and the fifth stage is the adulthood.
The first stage is the birth of the child. The second stage is the infancy. The third stage is the childhood. The fourth stage is the childhood. The fifth stage is the adolescence. The sixth stage is the adulthood. The seventh stage is the maturity. The eighth stage is the maturity.
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