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- replace all `switchMap` with `concatMap` because, in all previous uses of `switchMap`,
I really meant to wait for the source observable to complete _before_ beginning the inner observable whereas `switchMap` starts the inner observable right away.
IB

- replace all `switchMap` with `concatMap` because, in all previous uses of `switchMap`,
I really meant to wait for the source observable to complete _before_ beginning the inner observable whereas `switchMap` starts the inner observable right away.
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