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Surface P <br /> i ♦ I � <br /> � ` I <br /> I I <br /> I ' <br /> I I <br /> I I � <br /> I 1 <br /> I 1 <br /> I 1 <br /> Seam <br /> Ao As <br /> F%. 9.4.4 Superposition of surface subsidences(20). <br /> P Surface <br /> Mined <br /> I <br /> / Mined \ <br /> (al <br /> P Surface <br /> i <br /> A2 <br /> i <br /> Al h3 <br /> Aq <br /> t <br /> 1 / <br /> (b) <br /> I+il. l.4.S (a) "uivaArnt subcritical area and(b)principle of cyuivalcnce(20). <br /> 303 <br />