⭐HELLO MATE⭐
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There are many rules for the use of although. Some are:

*Although indicates that a particular situation does not have an expected effect.

*Although may also (and possibly more idiomatically) occur in the middle of each sentence, where it makes for a slightly stronger indication of unexpectedness.

*Never PUT a comma after although.

*Always attach an although idea to a complete sentence. Anything that starts with although is an EXTRA idea. It can’t stand alone: You have to attach it to a complete sentence.

*you can start a sentence with although! If you start a sentence with an although idea, end the idea with a comma, and follow it with a real sentence.

Suppose you wrote “Although the HURRICANE was headed our way.” This is an extra idea that can’t end with a period.

THESE ARE SOME OF THE RULES.

HOPE IT HELPS YOU. ☺️

AN EXAMPLE IS GIVEN BELOW
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It was recognized as the flu, although records describe conditions which were HIGHLY likely to have been polio.

MAKE SURE TO MARK IT AS BRAINLIEST ANSWER.