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combustível alternativo
energ.ind.	combustible secundario
R&D., energ.ind.	combustible alternativo; combustible de sustitución
transp., avia.	combustible para destinos alternativos
combustíveis alternativos
transp., energ.ind.	carburante de sustitución

combustível alternativo: 3 phrases in 2 subjects

Environment	1
Transport	2