| \( S \) | inani ngemuva \( t \) izinkathi |
| \( P \) | inani eliyinhloko (utshalomali lokuqala) |
| \( t \) | yinombolo yeminyaka imali ebolekwe ngayo |
| \( j \) | isilinganiso senzalo yonyaka (esingakhombisi ukuhlanganiswa) |
| \( m \) | Kukaningi lapho inzalo ihlanganiswa ngonyaka |