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1    12(2)| perhaps "easy," "obvious." See note on p. 12. ~
2    15(3)|      perhaps "indulgence." See note on p. 14. ~
3    18(4)|        Or "of arithmetic." See note on p. 19. ~
4 Note1   |                                Note from Vol. 1 Introduction,
5 Note2   |                                Note of the electronic source~
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