Scalar contained by vector of StaticArrays

Hi!
I want to check if an integer is contained by a vector of StaticArrays. Here’s an example (with regular arrays, but it’s the same issue).

a = [[1,2], [3,4]]
1 in a # false

I guess I could write a for loop, but that’s not very elegant.
Notes:

• The number I’m looking for will always be in the first “column” (i.e., first position of a subarray).
• If the number is in a, I will need to find it’s position, something like this: findfirst(x->x==1,a), which doesn’t work in this case either.

Thanks a lot!
PS: this is a silly question, but a difficult one to Google. The word “in” is a bit too common.

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