| http://www.w3.org/ns/prov#value | - ion rules; a selector coupled to the storage-medium and the rule-storage medium for selecting a line-item based on at least one of the line-item selection-rules; and a learning-material generator for generating learning materials on the selected line-item for the student; such that:a learnt line-item is a line-item that the student has achieved a preset level in learning that line-item; the select
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