assertEquals(100, bs.previousClearBit(100));
assertEquals(98, bs.previousClearBit(98));
assertEquals(95, bs.previousClearBit(97));
assertEquals(95, bs.previousClearBit(95));
assertEquals(64, bs.previousClearBit(64));
assertEquals(30, bs.previousClearBit(63));
assertEquals(30, bs.previousClearBit(32));
assertEquals(30, bs.previousClearBit(31));
assertEquals(30, bs.previousClearBit(30));
assertEquals(29, bs.previousClearBit(29));
assertEquals(20, bs.previousClearBit(20));