Columns
+--+--+--+--+--+--+--+--+--+
|  |  |  |  | b|  |  |  |  |
+--+--+--+--+--+--+--+--+--+
|  |b1|  |  |b2|  |  |b3|  |
+--+--+--+--+--+--+--+--+--+
|  | a|  |  | a|  |  | a|  |
+--+--+--+--+--+--+--+--+--+
|a1|a2|a3|a1|a2|a3|a1|a2|a3|
+--+--+--+--+--+--+--+--+--+
| 0| 1| 2| 3| 4| 5| 6| 7| 8|
+--+--+--+--+--+--+--+--+--+

Rows - Corner
+--+--+-+
|b |a | |
+--+--+-+
|b1 a1|0|
|   a2|1|
|   a3|2|
+-----+-+
|b2 a1|3|
|   a2|4|
|   a3|5|
+-----+-+
|b3 a1|6|
|   a2|7|
|   a3|8|
+-----+-+

Rows - Nested
+---------+-+
|b b1 a a1|0|
|       a2|1|
|       a3|2|
| --------+-+
|  b2 a a1|3|
|       a2|4|
|       a3|5|
| --------+-+
|  b3 a a1|6|
|       a2|7|
|       a3|8|
+---------+-+

Column x Row - Corner
+--+--------+
|  |    a   |
|  +--+--+--+
|b |a1|a2|a3|
+--+--+--+--+
|b1| 0| 1| 2|
|b2| 3| 4| 5|
|b3| 6| 7| 8|
+--+--+--+--+

Column x Row - Nested
+----+--------+
|    |    a   |
|    +--+--+--+
|    |a1|a2|a3|
+----+--+--+--+
|b b1| 0| 1| 2|
|  b2| 3| 4| 5|
|  b3| 6| 7| 8|
+----+--+--+--+

Row x Column - Corner
+--+--------+
|  |    b   |
|  +--+--+--+
|a |b1|b2|b3|
+--+--+--+--+
|a1| 0| 3| 6|
|a2| 1| 4| 7|
|a3| 2| 5| 8|
+--+--+--+--+

Row x Column - Nested
+----+--------+
|    |    b   |
|    +--+--+--+
|    |b1|b2|b3|
+----+--+--+--+
|a a1| 0| 3| 6|
|  a2| 1| 4| 7|
|  a3| 2| 5| 8|
+----+--+--+--+