Okay, the user wants me to translate "to-and-fro" into Spanish. Let me think. The term "to-and-fro" is an adverb meaning back and forth. In Spanish, the equivalent would be "de un lado a otro". Let me check if that's correct. Yes, "de un lado a otro" is commonly used to describe movement back and forth. Since the original content isn't in Spanish, I need to translate it. The user specified to provide only the translation without any explanations, so I'll just output "de un lado a otro".
de un lado a otro
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