[quote name='keeponehandloose' timestamp='1383838294' post='2269828']
apply the ruling to the key F# , and you have an
E# in the scale
[/quote]
Why the sad face, it makes perfect sense! At the risk of frying the brain of the OP further, we could get into double-flats and double-sharps, and how - outside the equal temperament system - G sharp and a flat aren't the same note...