【Used】 This is a set of abacus practice worksheets for levels 1, 2, and 3. I don't know much about abacus, but... The three books on the left in the first photo have answers in the back, but the four books on the right in the first photo do not have answers. There was a name written in pencil on the back, which I erased with an eraser, but there are still some indentations from the pressure of the writing m(_ _)m As they were used, there are clip marks, folds, stains, etc. Please check the photos m(_ _)m Please understand that these are used items stored at home before purchasing. Please refrain from buying if you are sensitive about such things.