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Which of the following types of tiles are laid in pairs of over-tiles and under-tiles?

Which of the following types of tiles are laid in pairs of over-tiles and under-tiles? Correct Answer Half-round country tiles

Half-round country tiles are laid in pairs of over-tiles and under-tiles. The under-tiles are laid with the concave surface upwards and the over-tiles are laid with the convex surface upwards. These tiles are similar to Spanish tiles.

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