This definition can be expressed as: set F is A collection of the process of people doing things, A is A collection of the process characteristics, if for any belong to F F, F the contained collection contains A logical relationship of action set features, we can say F in the collection process are adopted method A. Special: F contains only one element.
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My mother's love for the baby is like the grain of rice, complete and original. So the first time to add a supplementary food to your baby, choose the best! The rice flour made from grain rice is believed to be a better choice for mothers.