Hi,
It it the tip of dynamic column which is given with the Example set (see in line exampels).
First you merge block "cell1" and "cell2" in shot. Both of them extents the columns.
"cell1" extends the columns of title, "cell2" extends the columns of value. "cell2" also give the colmun names for block "b2".
After merging "cell1" and "cell2", the template looks like this:
col1 col2 col3
[b3.col1;block=table:table-row] [b3.col2;block=table:table-row] [b3.col3;block=table:table-row]
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Now block "b3" can be merged normally.
Note that TBS doesn't need to have "block=table:table-row" repated. Only the first one is taken in account.
Nevertheless, it doesn't disturb the merging.