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TWRoO said:
One problem... 13 weeks is 3 months

 

 Hmm... I'd given that some thought, & here's my rationale:

1st Month: 1 - 4 weeks

2nd Month: 5 - 8 weeks

3rd Month: 9 - 12 weeks

4th Month: 13 - 16 weeks

I figure that 13th is 4th Month, 1st week... but I can see how it might be confusing, so I won't mention 4th month from now on.