estaban triunfando
-they/you were triumphing
Imperfect progressive ellos/ellas/ustedes conjugation of triunfar.

triunfar

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Usando los mismos ladrillos que estaban triunfando en el mercado, ofrecían la posibilidad de diseñar una casa moderna.
Using the same bricks that were triumphing on the market, they were offering the possibility of designing a modern house.
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