When randomizing the order of Worldsoul, the number of possible unique permutations in which we can obtain fragments is given by:

However, there is one restriction: Sly Vessel Fragment 1 must be obtained before Sly Vessel Fragment 2. This condition reduces the total number of valid permutations.

Without restrictions, the total number of permutations would be:

With the restriction, only half of these permutations are valid, therefore, the total number of valid permutations is: