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The table below shows the possible outcomes for the sexes of two children, first and second, where each can be a Boy (B) or a Girl (G).

$\begin{aligned} second child \\ first child \end{aligned}$	$B$	$G$
$B$	$B B$	?
$G$	$G B$	$G G$

Find the missing outcome.

B B

B G

G B