FS_OPT_MUX_BOOL, /**< Muxb(sel, true, false) = sel */
FS_OPT_MUX_NOT_BOOL, /**< Muxb(sel, false, true) = Not(sel) */
FS_OPT_MUX_OR_BOOL, /**< Muxb(sel, true, x) = Or(sel, x) */
FS_OPT_MUX_BOOL, /**< Muxb(sel, true, false) = sel */
FS_OPT_MUX_NOT_BOOL, /**< Muxb(sel, false, true) = Not(sel) */
FS_OPT_MUX_OR_BOOL, /**< Muxb(sel, true, x) = Or(sel, x) */