Figure 5.

Probability space of X k1 Y k2 is a subset of X + Y k1 + k2. P(X k1 Y k2) is the sum of the probabilities taken over all values in the dark gray space, while P(X + Y k1 + k2) is the sum of the probabilities taken over both the light gray and dark gray spaces.

Carlson et al. BMC Bioinformatics 2006 7:254   doi:10.1186/1471-2105-7-254
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