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<br />I) 18~ ENTRY IS DRIVEN,SPITTING PILLAR <br />2)RIGHT SIDE IS SLABBED OFF <br />3) LEFT SIDE SLABBED OFF <br /> <br />-~- <br />20 <br />I__. <br />4 50' ~ ~ E- 20' -~ <br />-- -- ' <br /> <br />7.0' <br /> <br /> <br />i <br />70' , ~ <br />i <br />i <br />i <br />TYPICAL PILLAR EXTRACTION SEQUENCE <br /> <br />F/6URE / <br />-14- <br />