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The two main categories are convenience goods and shopping goods; two lesser categories are specialty items and unsought goods.
Deoxyribose and Ribose
descriptive and inferential
botany and zoology.
IT is separated into two main categories (1) those which process information, such as computer systems, and (2) those which disseminate information, such as telecommunication systems.
Plasma & mass
He saw socialism and the church as the two main threats of the new German state.
animal and vegetable
viruses and infections
linear and non-linear resistor