bestselling
/ˈb ĕ s t ˈs ĕ l ĭ ng, ˈb ĕ ˈs ĕ l ĭ ng/
bĕst-sĕl-lĭng, bĕst-sĕl-lĭng
Rule 1
Vowels usually say their short sound in a closed syllable.
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