Sum One’s Birthday Card

It’s sum-one’s Birthday everyday! So why not send them this awe-sum card with your nerdiest birthday wishes. This yellow card shows a summation equation in mathematics, indicated by the sigma symbol.

Greeting:  it’s sum-one’s birthday
Inside:  blank
Size:  A2, 5.5 x 4.25 in (14 x 10.8 cm)
Quantity:  1 card with envelope

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