| (subclass Month TimeInterval) | Merge.kif 9065-9065 | Month is a subclass of time interval |
| (subclass January Month) | Merge.kif 9070-9070 | January is a subclass of month |
| (subclass February Month) | Merge.kif 9084-9084 | February is a subclass of month |
| (subclass March Month) | Merge.kif 9108-9108 | March is a subclass of month |
| (subclass April Month) | Merge.kif 9122-9122 | April is a subclass of month |
| (subclass May Month) | Merge.kif 9136-9136 | May is a subclass of month |
| (subclass June Month) | Merge.kif 9150-9150 | June is a subclass of month |
| (subclass July Month) | Merge.kif 9164-9164 | July is a subclass of month |
| (subclass August Month) | Merge.kif 9178-9178 | August is a subclass of month |
| (subclass September Month) | Merge.kif 9192-9192 | September is a subclass of month |
| (subclass October Month) | Merge.kif 9207-9207 | October is a subclass of month |
| (subclass November Month) | Merge.kif 9221-9221 | November is a subclass of month |
| (subclass December Month) | Merge.kif 9235-9235 | December is a subclass of month |
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