Table 2. Letter to item number conversion key for figure 2.
| Item | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| J | G | d | g | F | c | j | E | f | C | I | a | b | i | B | A | h | e | H | D |
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