The eight vertices of the hexadecachoron are ( Â 1 , 0 , 0 , 0 ) , ( 0 , Â 1 , 0 , 0 ) , ( 0 , 0 , Â 1 , 0 ) , ( 0 , 0 , 0 , Â 1 ) . The eight vertices of the 16-cell are ( Â 1 , 0 , 0 , 0 ) , ( 0 , Â 1 , 0 , 0 ) , ( 0 , 0 , Â 1 , 0 ) , ( 0 , 0 , 0 , Â 1 ) .