 However, giving up on any of these three principles may be too drastic. Suppose, e.g., that, apart from the obligations (1) and (2) mentioned above, I also face the obligation to visit Tom (\(t\)), and in case I visit Tom, to hand him over a letter from Jane (\(l\)). So we have as premises \(\OB j\), \(\OB \neg j\), \(\OB t\), \(\OB (t \rightarrow l)\). Suppose moreover that \(t\) and \(l\) are perfectly compatible with either of \(j\) or \(\neg j\). Then any of the three above-mentioned strategies would still invalidate the inference to \(\OB l\): we can no longer infer that I ought to hand over the letter.