[R] Find characters in a matrix and return a TRUE-FALSE vector

[Vitrifizierung]

I have the following problem:

My data is a matrix of multiple columns and rows. The column I am interested
in looks like that (I think it is a column in a matrix that contains a
vector each?):

[[1]]
[1] A B C
[4] D E

[[2]]
[1] A D E

[[3]]
[1] C E F
[4] G

I now want to look for a special word (for example C; in my case the single
entries are words, not single letters) and return a vector, like

[1] TRUE FALSE TRUE

Is there an easy way to do it?
Sorry, I am really a beginner and I did not really solve the problem by
looking into other threads...

Thanks a lot,
Nina

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