Unix: How can you echo a variable name made of variable names I.e $$var1$var2

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Peter Schneider
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How can you echo a variable name made of variable names I.e $$var1$var2 duplicate
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(unix.stackexchange.com/users/673378/dan-larrabee)Dan Larrabee
(unix.stackexchange.com/users/237982/jesse-b)jesse_b
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