| http://www.w3.org/ns/prov#value | - n when not perceived ??? ??? ??? preoperational stage according to Piaget, the stage (from about 2 to 6 or 7 years of age) during which a child learns to use language but does not yet comprehend the mental operations of concrete logic ??? ??? ??? conservation according to Piaget, the principle that properties such as mass, volume, and number remain the same despite changes in the form of object ??
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