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test active draft. a technical sketch. general, before special —alignment, before distraction #1.1 a #1.1.1 b #2.1 c #2.1.1 e this section includes alt text 1 2 $Pa , {}_{Me}^{\cup} , {}_{Me}^{\cap} , {}_{Me}^{\cap\varnothing}$ $Pa , {}_{Me}^{\cup} , { }_{Me}^{\cap} , { }_{Me}^{\cap\varnothing}$ $Pa , { }_{Me}^{\cup} , { }_{Me}^{\cap}$ , the symmetric difference ${}^{\cap ^{\triangle}}$ (or common complement ${}^{\cap ^{\complement}}$), is the set-of-all measures ${}^{\cup}_{Me}$ , minus the set-of-common measures ${}^{\cap}_{Me}$ : $${}^{\cup}_{Me} \setminus {}^{\cap}_{Me} = {}^{\cap ^{\triangle}}_{Me} | {}^{\cap ^{\complement}}_{Me}$$...