Merging table rows instead of splitting them?

Question

I have a table that looks like this:

| COLUMN A | COLUMN B | COLUMN C | COLUMN D |
|-------------------------------------------|
|    0     |    A     |   100    |   150    |
|    1     |    B     |   100    |   150    |
|    2     |    C     |   200    |   250    |
|    3     |    D     |   200    |   250    |

As you can see, the values in columns A and B are different each row, but columns C and D only change every other row. It would be useful to merge only columns C and D so that they are "shared" between two rows, while columns A and B work as normal. Something like this, but without the blank cells in A and B:

| COLUMN A | COLUMN B | COLUMN C | COLUMN D |
|-------------------------------------------|
|    0     |    A     |          |          |
|          |          |   100    |   150    |
|    1     |    B     |          |          |
|    2     |    C     |          |          |
|          |          |   200    |   250    |
|    3     |    D     |          |          |

Essentially, it would be the inverse of this answer, which merges the first column in the table and splits subsequent columns.

Answer 1

\documentclass{article}
\usepackage{multirow}

\begin{document}
\begin{tabular}{|*{4}{c|}}
    \hline
A   &   B   &   C   &   D   \\
    \hline
0   &   A   & \multirow{2}{*}{100}  &   \multirow{2}{*}{150}  \\
1   &   B   &                       &                       \\
0   &   A   & \multirow{2}{*}{100}  &   \multirow{2}{*}{150}  \\
1   &   B   &                       &                       \\
    \hline
\end{tabular}
\end{document}