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beause her boobs are small and set wide apart. if they're set wide apart, cleavage isn't very visible because it's mainly revealing a shallow incline into the sternum-area. Cynthia also has small boobs, probably wide apart, so it's probably just sternum-area being revealed as well.
have fun looking at sternum-area.
I've done an illustration to show what it looks like. (cat face not informational.)