Notwithstanding subsection (b)(2) of this section, a board of trade that is or elects to become a registered derivatives transaction execution facility may trade on the facility any agreements, contracts, or transactions involving excluded or exempt commodities other than securities, except contracts of sale for future delivery of exempt securities under section 3(a)(12) of the Securities Exchange Act of 1934 [
15 U.S.C.
78c
(a)(12)] as in effect on January 11, 1983, that are otherwise excluded from this chapter under section
2
(c),
2
(d), or
2
(g) of this title, or exempt under section
2
(h) of this title.