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. 2020 Jan 27;22(2):150. doi: 10.3390/e22020150
A˜C C˜B A˜B (A˜C)˜(C˜B)
wa wa wa
wb wb wb
wc wc wc
wxA wxB |wxAwxB| (wxA+wxB)
|wyAwyC| wyC wyA |wyAwyC|+wyC
wzC |wzCwzB| wzB wzC+|wzCwzB|
|wpAwpC| |wpCwpB| |wpAwpB| |wpAwpC|
+|wpCwpB|