Book, Paragraph

1      I, 29|   are possible.~Each of the problems then can be proved in the
2      I, 29| another way, e.g. universal problems by the inquiry which leads
3      I, 42|   every figure, but certain problems in each figure, it is clear
4      I, 45|                 45~Whatever problems are proved in more than
5     II, 11|    per impossibile.~All the problems can be proved per impossibile
6     II, 12|     in the first figure all problems except the universal affirmative
7     II, 14|  terms to prove each of the problems ostensively as well. Similarly