People often mix up then and than, even native speakers. But they have very different meanings.
Then is used to talk about time, order, or results. It tells us what happens next, or what happened at a certain time.
Use then when you're talking about what happens next, or about a result (if... then...).
Than is used to compare: it shows a difference between two things.
Use than when you're comparing one thing to another.
The “a” in than is for “compAre.” If you’re not comparing, use then.
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