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428067814

Chalkboard not well sponged. The simplest arithmetic problem in mathematics - adding two numbers together. White brick wall.

White brick wall. Its written in white chalk on a blackboard - two plus two equals four. The basics of arithmetic start with the youngest grades in every school in the world.

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Size Width Height Mp
s 500 px 333 px 0.5
m 1000 px 667 px 2
l 2000 px 1333 px 8
xl 6720 px 4480 px 15

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