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make change
math.	dar cambio; calcular el cambio (If the emphasis is on computation, use calcular; if the emphasis is on providing the change, use dar. In general Spanish uses the article in a phrase like calcular el cambio, but note that one might use calcular cambio in headings, just as one would use Sumar fracciones as a title but use Suma las fracciones as a direction)

make change: 7 phrases in 2 subjects

Electronics	5
Power system protection	2