Pattern Explanation--What is meant by *work 123 sc along each side of blanket?

The question pertains to the 1st round of lace edging for a baby blanket. It calls for 2 sc in first dc (clear enough). *Work 123 sc along each side of Blanket and 3 sc in corners. Idon't understand what they really want me to do. Can anyone enlighten me, please?

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