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100 <br />90 <br />.~ <br />W <br />Q 70 <br />J <br />W <br />`'' 60 <br />H <br />Z <br />W <br />~ 50 <br />W <br />~. <br />j 40 <br />H <br />Q <br />J <br />~ 30 <br />V <br />20 <br />10 <br />0 <br />HEIGHT QF CHIMNEY CQLLAPSE feet) <br />