I am not sure what you mean using google to back it up. You don’t use google to add 2+2. The math is very imple and you can do it yourself. If the population grows every year by some percentage, say 5% for example, then in 2021 if there were 100 boys and 100 girls born (assuming approximately the same of both), so in 2022 there will be 105 boys and 105 girls born and in 2023 110 or more boys and girls each born. If then the boys and girls marry at close in age there are equal numbers for all. If the boys from 2021 marry the girls born in 2025 – there are more girls so not enough matches. It is essentially that simple. It helps to draw it all out on paper and try to draw lines to pair them up so that it is more clear to those that are more visually oriented.
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