Assertion: typical block | /r/CapableOf | make sure to leave a 3/8 inch gap
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text: Lay out the block, making sure to leave a 3/8 inch gap between the blocks to allow for the vertical mortar joints (i.e., a typical 8x8x16 block is actually 15-5/8 inches long and 7-5/8 inches high to accommodate the mortar joint).