comb_1 asin
comb_2 cube
comb_3 cubert
comb_4 exp
comb_5 sin
comb_6 sqrt
comb_7 cos
comb_8 log
comb_9 acos
comb_10 asinh
comb_11 atanh
comb_12 lin
comb_13 tanh
comb_15 square
comb_16 tan
comb_17 atan
comb_18 acosh