To provide a knowledge-based paper which facilitates memorization from a visual point of view by expressing nineteenth graphic form.SOLUTION: Numerals 0 to 9 are shown at ten corners of a decagon on a plane, and lines are drawn in the order of designated numbers with 0 as a starting point in pencil or the like. Or 10 corners on a flat plate, with protrusions on the corners, indicating numbers from 0 to 9, and hanging strings in the order of the designated number starting from the 0 projection as the designated number. One step, in order of 01234567890. The order of the second stage 02468024680. The order of the third stage 03692581470. The fourth stage 04826048260 order. In the order of the fifth stage 05050505050. Sixth stage 06284062840 in order. The order of the seventh step 07418529630. In the order of eight steps 08642086420. Ninth stage 09876543210 order. The figures that are produced at each of the nineteen steps are different, so you can memorize it happily.(FIG.
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