Beats 3 & 4 of measure two are an altered four note grouping, relative to the dominant (G7), leading back to the targeted tonic chord C minor (or Major).
There are a bunch of ways you could reharmonize this line, superimpose it over different key centers, etc., but I haven't messed with that so far.
In any case, it's a cool device for momentarily steppin' "out", and then slidin' back "in".
Have fun!
Here's a pdf to download, in all 12 keys.
B.Stern
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