What are all the 3 digit combinations of 21 using 1 - 10?

Working on a project and I'm pretty sure I'm missing several combinations.

P.s. 5,7,9 is the same as 5,9,7 so I don't need both.
Update: Sorry, I've been looking at the problem for so long I forgot to explain what I was asking for.

I'm looking for 3 number combinations with the sum of 21( for example 5+9+7 ) using the numbers 1 - 10.
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