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r <br />0 <br />�n <br />�v <br />�C <br />n� <br />r t <br />n ; <br />�0 <br />m.r <br />zmn � <br />O <br />o <br />n <br />v N <br />e <br />r <br />n= <br />DD <br />r � <br />N = <br />ma <br />nD <br />�v <br />0 <br />z <br />FIGURE 12 -1 <br />12 <br />00 <br />a <br />r" <br />z D <br />O cn <br />r <br />p <br />co C) <br />r O <br />[Zip <br />D <br />O <br />z <br />Z < <br />m <br />n= <br />DD <br />r � <br />N = <br />ma <br />nD <br />�v <br />0 <br />z <br />FIGURE 12 -1 <br />12 <br />