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This report describes tutoring systems, which offer students to enter full solutions of the problems instead of completing tests with multiple-choice questions. Students solve problems by entering steps, after the student enters a step, he/she can ask if the step is correct or not. Also students are able to get hints (what to do as a next step) and get marks for their solutions. This report describes experience of construction of this sort of systems fulfilled by our research group, as well as known results and possible future research directions.