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Given an N by M matrix consisting only of 1's and 0's, find the largest rectangle containing only 1's and return its area.

For example, given the following matrix:

{{1, 0, 0, 0},
 {1, 0, 1, 1},
 {1, 0, 1, 1},
 {0, 1, 0, 0}}

Return 4.