| 摘要 |
This equipment comprises: a set of rectangular elements of defined length in a simple or double ratio, which are white or coloured and a set of oval elements of corresponding dimensions and colours; a set of square elements with the same surface area and of the same colour; a set of rectangular elements, of different lengths and of the same colour, and a set of corresponding oval elements; and a set of two elements of the same length and of two different colours corresponding respectively to the major scale and to the minor scale.
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