The program TMSOC was used to classify TMSs into three types: complex, twilight and simple. A) Frequency of the type of TMS per TMS position as reported by TMSOC across 658 MFS members with 12 TMSs. B) Frequency of simple TMSs per TMS position. Note that 1) all TMSs are predominantly complex, 2) all TMSs have a small frequency of simple TMSs, and 3) the frequencies of simple TMSs in positions 3, 6, 9, and 12 is larger than TMSs in positions 1–2, 4–5, 7–9, and 10–11.