TIB: searching matrixes

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TIB: searching matrixes

is there a way to search a matrix to find a number in any row or column without having to look at each individual row and column
eg
[[1 2]
 [3 4]]
if [a](1,1) = 2
then
whatever
if [a](1,2) = 2
then
whatever
if [a](2,1) = 2
then
whatever
if [a](2,2) = 2
then
whatever
instead of this something that does searches the matrix in one command
 
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