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Not all places in the world have the same seasonal schedule. So, December is not the coldest month in all places in the world.

The given statement is 鈥淚f a clothing store is selling wool coats, then it must be December鈥�. Here, the hypothesis is 鈥渁 clothing store is selling wool coats鈥� and the conclusion is 鈥渋t must be December鈥�.

The given statement implies that December is the coldest month as wool clothes are worn in the winter when it is cold.

Consider a place like South Dakota. It experiences the heaviest snow and is thus coldest in the month of April, not December.

This implies that wool coats may be worn in months other than December. That would in turn imply that wool coats may be sold by shops in months other than December.

Even if in a place, December is the coldest month, winter products can be sold in the months leading up to winter or even after it as stock clearance.

So, the hypothesis, 鈥渁 clothing store is selling wool coats鈥� is true. However, the conclusion, 鈥渋t must be December鈥� is false.