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Survey, read, review
Reduce, Reuse, Recycle
S. R. Bland has written:
'Agard three-dimensional aeroelastic configurations'
reuse reduce and recycle
If Q = R/S then R = QxS and S = R/Q You can easily replace the letters with numbers such as Q = 2, R = 6 and S = 3 and then write out all three equations and you'll see that they make sense.