Premise: Tanzania . Swahili and English are Tanzania 's official languages . A highly multilingual country , Swahili is used in parliamentary debate , in the lower courts , and as a medium of instruction in primary school ; and English is used in foreign trade , in diplomacy , in higher courts , and as a medium of instruction in secondary and higher education , although the Tanzanian government plans to discontinue English as a language of instruction altogether . Most Tanzanians thus speak both Swahili and a local language ; many educated Tanzanians are trilingual ; also speaking English .
Hypothesis: Tanzania's population communicates solely through sign language.
Label: CONTRADICTION