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What is the difference of meanings between the spellings しまう、仕舞{しま}う、終{しま}う、了{しま}う? Or at least, between the first two? (They are marked as common.)

If there is a source about such nuances, I'll appreciate links.

More specifically:
I know that しまう (in kana spelling) is a subsidiary verb, and a very common one. Besides that, I want to learn the full verb pronounced 【しまう】 (¹to finish; ²to close down; ³to put away). So:

1. Is the kana spelling しまう used for the full verb at all?
2. If I want to translate the full verb into Japanese, how do I choose the spelling?

What is the difference of meanings between the spellings しまう、仕舞{しま}う、終{しま}う、了{しま}う? Or at least, between the first two? (They are marked as common.)

If there is a source about such nuances, I'll appreciate links.

More specifically:
I know that しまう (in kana spelling) is a subsidiary verb, and a very common one. Besides that, I want to learn the full verb pronounced 【しまう】 (¹to finish; ²to close down; ³to put away). So:

1. Is the kana spelling しまう used for the full verb at all?
2. If I want to translate the full verb from English into Japanese, how do I choose the spelling?