p_{[a-b-c]}=p_b\frac{p_a}{1-p_b}\frac{p_c}{1-p_a-p_b}+p_c\frac{p_a}{1-p_c}\frac{p_b}{1-p_a-p_c}+p_c\frac{p_b}{1-p_c}\frac{p_a}{1-p_b-p_c}
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