One such arrangement is 6 7 5 8 4 3 9 2 0 1 from front (6) to back (1).[1][8] Russian ИH-12A (IN-12A) and ИH-12B (IN-12B) tubes use the number arrangement 3 8 9 4 0 5 7 2 6 1 from front (3) to back (1), with the 5 being an upside down 2. The ИH-12B tubes feature a bottom far left decimal point between the numbers 8 and 3.