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If high school clinics are to stem the tide of teenage pregnancy, then they must dispense birth-control devices; but if they want to discourage illicit sex, then they must not dispense these devices. Since high school clinics must either dispense or not dispense birth-control devices, either they will not stem the tide of teenage pregnancy, or they will not discourage illicit sex. (S, D, I)

Translate the following arguments into symbolic notation and then interpret them in light of the eight argument forms presented in this section. In some cases a symbolized argument must be rewritten using commutativity or double negation before it becomes an instance of one of these forms. Those not having a named form are invalid. The letters to be used in translating the statements are given in parentheses.