RADII - if 2 then I is the fifth letter - not R from ROCKS - 0, not D from RODEO - 0, not the first I from EERIE - 0; if 1 then fourth letter is J - from HAJJI - 2 not H from HAPPY - 1 (the A as established), not the first J from MAJOR - 1 (again from the A), and not the I if RADII - 1 (again from the A)