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Step * of Lemma eu-seg-length-test

∀e:EuclideanPlane. ∀[a,b,c,d,x,y:Point].  (ba=xy) supposing (dc=yx and ab=cd)
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Latex:
\mforall{}e:EuclideanPlane.  \mforall{}[a,b,c,d,x,y:Point].    (ba=xy)  supposing  (dc=yx  and  ab=cd)


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