I don't understand what 'as in' means or how to use it. For example"
"savory as in"Which do you prefer, sweet foods or savory foods?"
In this context, what does "as in " mean and where does it modify savory foods?
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'As in' doesn't modify anything; it is an idiom combining two prepositions: 'as' which makes a comparison, and 'in' which identifies a subset. The quoted question after 'as in' serves as a noun phrase (because it is in quotes), and it contains the words being compared.
'As' can also be used as a conjunction [of comparison], but then neither the quotes or the combination with 'in' would be appropriate.