Most people work Saturdays because that's when they need the most people. Seems kind of stupid to try to put down the less busier days because "less people work those days". There's a reason that less people work those days = less shifts = more competition for those shifts.
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So when you're happy (Hurray!), or sad (Aw!),
Or frightened (Eeek!), or mad (Rats!)
An interjection starts a sentence right.