comb_1 acos
comb_2 exp
comb_3 atan
comb_4 cube
comb_5 sin
comb_6 cos
comb_7 square
comb_8 tan
comb_10 atanh
comb_11 cubert
comb_12 asin
comb_13 acosh
comb_15 lin
comb_16 tanh
comb_17 log
comb_18 asinh