hubieran colocado
Past perfect subjunctive ellos/ellas/ustedes conjugation of colocar.

colocar

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Al encontrarse en el interior y estar recubiertas de frita de cerámica blanca, parecen suaves y redondeadas, un efecto que no causarían si se hubieran colocado en el exterior, la opción más común.
Since they are inside and covered with white ceramic frit, they seem smooth and rounded, an effect they would not produce if they were placed on the outside.
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