Is there an optimal sequence for language acquisition?

Is there an optimal order in which to learn languages? Consider a
student who wants to learn latin, attic greek, german, and russian.
(Assume the student's native language is english, and assume an average
proficiency in grammar.) Is there a specific sequence that is most
efficient?

Moreover, is there a general rule of thumb? That is, I suspect that
similar languages can be grouped, and those groups can be sequenced
according to difficulty or "foreign-ness". What does that sequence look
like?

.

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