I really have no idea where to begin with this...am I supposed to assign sentences to p, q, or r and then somehow combine them into one sentence and then make a compound proposition using the symbols we've learned? I have no clue how I would break it up into smaller sentences. Can someone help point me in the right direction?

"Construct a compound proposition that asserts that every cell of a 9x9 Sudoku puzzle contains at least one number."

Thank you to anyone who can help me! I am so lost on this.