Dusit's telling that they were being charged and arrange these question topics to analyze consumers in several groups. The group is used and known to the group, but the product is unknown.
The Dusit poll that I've got to think and sort this question to be analyzed in many consumer groups. The group was used and known But unknown to those who used the product.
The Dusit poll reported that he has figured out and arrange the question topic like this to the consumers in many groups, group is used and known. The group used but unknown products.