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| as.Formula | Extended Formulas |
| Formula | Extended Formulas |
| formula.Formula | Extended Formulas |
| has.intercept | Extended Formulas |
| is.Formula | Extended Formulas |
| length.Formula | Extended Formulas |
| model.frame.Formula | Extended Formulas |
| model.matrix.Formula | Extended Formulas |
| terms.Formula | Extended Formulas |
| update.Formula | Extended Formulas |