| 摘要 |
Grid which consists in an outer strip which determines a closed, hollow figure and which accommodates dowels (male appendices) and recesses (female appendices) with no further conditions other than that of being symmetrical with respect to a longitudinal axis and that, for each dowel, we place a recess in a symmetrical position so that, upon rotating the piece through 180 degree, this piece coincides with another identical one in order to form the grid. In addition to the perimeter strip, there are inner strips which are also distributed symmetrically with respect to the axis of symmetry of the piece. <IMAGE>
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