then what we just discussed is that through a number of rules that look like if-then, you can ensure that the snapshot is at a certain point in time t and at the following time point fit together, and then finally, since this here is a decision problem, we want to ensure that the boolean formula can only be satisfied if at certain point in time the algorithm returns yes, so this is the last part we have to add to the boolean formula, and this is actually quite easy to ensure, because once the algorithm reaches this line of the code, wherever it may be, and you can even have multiple lines where the algorithm returns yes, but once such line has been reached, the algorithm returns yes and stops, so this her is very easy to ensure.