Maybe because Block A is heavy and Block B is light it depends
on the weight.
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Actually, it's "block and tackle"; as in, "The block and tackle was described by Hero of Alexandria". Let's set up a block and tackle to lift these loads.
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Block Island Ferry
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The Pontiac G6 block heater is located on the right hand side of
the engine. The block heater can be located by following the block
heater cord.