# Reducing an expressing modulo a variable expression

I have some integer matrices, and I am interested in their behaviour mod `p^2`

. I have declared variables using
```
var('p a11 a12 a13, ...')
```

etc, and after multiplying my matrices I am left with some very messy entries, involving lots of `p^2,p^3,...`

terms. Since I only care about behaviour mod `p^2`

, I would like Sage to just ignore those higher order terms. I feel like there must be an easy way to do this, but I don't know what it is. Any help would be much appreciated!

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