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- f(x, y) = 2^x * y * c
- 1011100000 given result
- 100000 x=5
- * 10111 y=23
- 1011100000 given result
- ^ most sig non-zero bit is here
- 10111000 take eight bits for y=184
- * 100 this times y is result; conclude x=2
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