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Excuse me, are these square cubic liters learned in the first book or the second book of primary school mathematics?
"Square" is in "Rectangular Area", the second volume of third grade mathematics published by People's Education Press.

"Cubes" are in the fifth grade mathematics volume of People's Education Press, cuboids and cubes.

Up to volume in the second volume of fifth grade mathematics of People's Education Press, cuboids and cubes-volume and unit of volume.