Erasing is easy - once you got the concept:
Ever line you paint is stored as vecor element. The eraser deletes those vector elements. So you touch a line with the eraser and it disapears completely. Note that it first gets overpainted with a white line, so there are some artifacts on screen. Once the screen is refreshed (e.g. by selecting the paint brush again) it is completly gone. BTW, I like the artifacts, so I can see what I just deleted...
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