I have four boys, B1 and B2 are just over 4 years apart, B2 and B3 are 20 months apart and B3 and B4 are again 4 years apart.
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I have four boys, B1 and B2 are just over 4 years apart, B2 and B3 are 20 months apart and B3 and B4 are again 4 years apart.