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££&;,..... world-builder's shortcut,  to  define  a .....,;&££
##£#&†;~,. section of  reality and imply its  size: .,~;†&#£##
##£#&†;~,. place a flock of  birds at  the edge and .,~;†&#£##
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##†;,..... as  five  vertices;  six  triangles.  (i .....,;†##
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