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SCALE CHORDS are chords harmonized to it's scale - basically chords that will work automatically because they are made from notes within that particular scale
A I Type chord in the key of C could be CMajor-CMajor7-CMajor6 etc..
a II Type chord could be Dminor-Dminor7-Dminor6 etc..
a III Type chord could be Eminor-Eminor7-E7sus4 etc.... etc......
see the diagram charts here