How can I determine whether a value exists anywhere within a multidimensional array variable with multiple levels?

I am trying to write a loop that adds various numbers to a two-dimensional array. The loop needs to check whether, for each loop case, a value associated with this case is already present in the array (and if it is, then skip to the next case).

If I have a single dimension array, I can use the MATCH function to achieve this checking task: 

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However, if I add another level to the first dimension of the array variable, this doesn't work (as MATCH obviously only searches in one column). So, this doesn't work:

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In my scenario, two types of solutions would work: either a solution that checks whether the value exists anywhere in the array variable, or a solution where I specify one particular dimension of the array variable, and check in that.

Any suggestions much appreciated.