| pass 0: "level_1" exactly matches "level_1" |
| pass 1: "level_1 level_2" exactly matches "level_1 level_2" |
| pass 2: "level_1 level_2 level_3" exactly matches "level_1 level_2 level_3" |
| pass 3: "level_1" contained in "level_1 level_2 level_3" |
| pass 3: "level_1" contained in "level_1 level_2" |
| pass 3: "level_1" contained in "level_1" |
| pass 4: "level_1 level_2" contained in "level_1 level_2 level_3" |
| pass 4: "level_1 level_2" contained in "level_1 level_2" |
| pass 5: "level_1 level_2 level_3" contained in "level_1 level_2 level_3" |
| pass 6: "" exactly matches "" |
| pass 7: "" contained in "" |
