(Optional) Choose which three-level solver to use.
(Optional) Choose which three-level solver to use. Possible values are:
1 3-level multiplicative solver (01210) 3 3-level multiplicative solver (02120) 5 3-level multiplicative solver (0102010) 7 3-level multiplicative solver (0201020) 2 3-level additive solver (0+1+2) 4 3-level additive solver (010+2) 6 3-level additive solver (1+020) 8 3-level additive solver (010+020) The default is
. See the user's manual for more details.