It is the expression t - s
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8-t-s
There are much more than three types of scales, but the 3 basic scales are the common major scale (T T S T T T S), the harmonic minor (T S T T S T1/2 S) and the melodic minor (T S T T T T S ascending - T S T T S T T descending). In brackets noticed I labelled the structure of the scale in tones and semitones. T = tone S = semitone T1/2 = minor 3rd/augmented 2nd interval (3 semitones)
A shape that has fewer than 8 faces and fewer than 10 edges is a triangular prism. A triangular prism has 5 faces (2 triangular faces and 3 rectangular faces) and 9 edges. It meets the criteria of having fewer than 8 faces and fewer than 10 edges.
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5 is 14 fewer than 19.