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In trapezoid ABCDABCDABCD , AB‾\overline{AB}AB and CD‾\overline{CD}CD are perpendicular to AD‾\overline{AD}AD , with AB+CD=BCAB+CD=BCAB+CD=BC , AB<CDAB<CDAB<CD , and AD=7AD=7AD=7 . What is AB⋅CDAB\cdot CDAB⋅CD ?