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Find number abc

If 5cb0b - 2b1ba = 2561a find number abc. Multiple solutions may exist.

Correct answers: 10

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Yabba dabba doo...

Yabba dabba doo! Happy friday to you!

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Black American patent

In 1871, a "Locomotive Smoke Stack" was patented by black American inventor L. Bell (No. 115,153).

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