Naive tabulation for 2-dim nonterminals (alternative visualization)
The solution for the subword pair $(i..j,k..l)$ is stored at $M[i,j,k,l]$ where $M$ is a four-dimensional matrix. This results in severe space loss as the cells representing invalid subwords ($i>j$ or $k>l$) or overlapping subwords are never filled. Compare this with the strategy that eliminates the space loss of invalid subwords.
The visualization fixes the first index of the first subword and then displays the three-dimensional matrix for it. See also an alternative visualization.
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