S.L.O.A.P. = space left over after planning. (town planning and landscape architecture)
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Bathroom or kitchen should be square and level. The plumbing drain lines need slope to drain properly.
the answer is that if you were going up a moantain on a high sloap and you were trying to pass someone you would press the button for that it kicks in a little bit more horse power and helps you gain a little speed and gets you a little more hoarse power