 However, Aristotle probably did have something like a de re reading of the categorical sentences in mind, as many scholars have come to realize and as most medievals who read him thought. But if the conversion rules must be given a de dicto interpretation and the different syllogisms a de re interpretation, the whole system seems to collapse. This problem makes a consistent reconstruction of Aristotle’s modal syllogistic using modern modal logic very difficult. (See Becker 1933, Lukasiewicz 1957, Rescher 1974, van Rijen 1989, Patterson 1995, Thom 1996, Nortmann 1996 and Malink 2013 for such attempts, and see Hintikka 1973 and Lagerlund 2000 for critical reflections on these attempts.)