smaller mustard have genetic isotopes of smaller weight
white_mustard is mustard. hn2_mustard is nitrogen_mustard. nitrogen_mustard_gas is nitrogen_mustard. hn1_mustard is nitrogen_mustard. hn3_mustard is nitrogen_mustard. powdered_mustard is mustard. yellow_mustard is mustard. honey_mustard is mustard. black_mustard is mustard. nitrogen_mustard is compound.