I need to join the table I'm using to itself multiple times.
ID_B joins to ID_A and there are up to 6 depths total.
ID_A DESCR ID_B DEPTH
1 CAR 0 1
2 PLANE 0 1
3 TRAIN 0 1
5 COMPACT 1 2
7 SUBCOMPACT 5 3
8 SUV 1...
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