connect

o o-i o-ii o-iii o-iii-i o-iii-ii o-iii-iii o-iii-iii-i o-iii-iii-ii o-iii-iii-iii o-iii-iii-iii-i D D-i D-ii D-iii D-iii-i D-iii-ii D-iii-iii D-iii-iii-i D-iii-iii-ii 0 0-i 0-ii 0-iii
substrate