Reply to "just as I played the guitar"

Thank you so much David for this clear reply!

I messed up when writing my question! My apologies.

(e) and (f) were supposed to have commas.

e. He played the piano, as I played the guitar.
f.  He played the piano, just as I played the guitar.

Could you tell me which of the following the correspond to:

1. He played the piano while I played the guitar.
2. He played the piano and I played the guitar.
3. He played the piano because I played the guitar.
4. He played the piano in the same way I played the guitar.

Many thanks.

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