[Graphs generated by this script: setBorder(60,30,60,30);initPicture(-10,10,-10,10); fontsize=14;fontstyle='none';marker=null;line([10,0],[-7.0710678118655,7.0710678118655]);line([10,0],[-7.0710678118655,-7.0710678118655]);line([7.0710678118655,7.0710678118655],[-1.836970198721E-15,-10]);line([6.1232339957368E-16,10],[-7.0710678118655,7.0710678118655]);line([6.1232339957368E-16,10],[7.0710678118655,-7.0710678118655]);line([-10,1.2246467991474E-15],[-1.836970198721E-15,-10]);line([-10,1.2246467991474E-15],[7.0710678118655,-7.0710678118655]);fontbackground='white';fontfill='blue';text([10,0],'A','belowright');dot([10,0]);fontfill='blue';text([7.0710678118655,7.0710678118655],'B','aboveright');dot([7.0710678118655,7.0710678118655]);fontfill='blue';text([6.1232339957368E-16,10],'C','aboveright');dot([6.1232339957368E-16,10]);fontfill='blue';text([-7.0710678118655,7.0710678118655],'D','aboveleft');dot([-7.0710678118655,7.0710678118655]);fontfill='blue';text([-10,1.2246467991474E-15],'E','aboveleft');dot([-10,1.2246467991474E-15]);fontfill='blue';text([-7.0710678118655,-7.0710678118655],'F','belowleft');dot([-7.0710678118655,-7.0710678118655]);fontfill='blue';text([-1.836970198721E-15,-10],'G','belowleft');dot([-1.836970198721E-15,-10]);fontfill='blue';text([7.0710678118655,-7.0710678118655],'H','belowright');dot([7.0710678118655,-7.0710678118655]);]

Which vertices are even?

Which vertices are odd?