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7F2E: Parser: clear the current frame
Clears the 24 bytes of the frame at IY, and the two bytes of the verb of the frame after it (at IY-24), so that the next frame starts empty.
7F2E PUSH IY HL = the current frame
7F30 POP HL
7F31 LD B,$18 24 bytes to clear: the whole frame
7F33 CALL $70D9 Clear it
7F36 LD (IY-$18),B Also clear the verb of the frame that comes after this one (2 bytes, 24 further along)...
7F39 LD (IY-$17),B ...(B is 0 here, left over from the clearing loop) so it starts empty too
7F3C RET
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