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<br />Fiqure 8. 4Jest w~11, stair-step pattern. <br /> <br /> .i <br />r <br /> <br />.. ~._ .i <br />~ ..:L`1 <br />,~ ~ ..^ ~: <br />J~.:e~_ ~. _._c~ _ ---- ... ~_. _... .;il i::ce and •: egetatice _,. ~:er, Bec~`.~ _. <br />