Pattern explaination: What is 3 sc in ch?

if I have 15 chains:

and they tell me to make 1 sc in 13 ch, then 3 sc in 1 ch, 1 sc next 12 ch, 2 sc in next ch.

I have two questions, what is the 3 sc in 1 ch? and after the 3 sc in 1 ch, do I turn?

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