Consider the set A of all strings of letters a-f of length 6. A few elements of this set are dcebac, ebaafe, and abeafa. What is the cardinality of each of the following sets? Please indicate which of the principles of multiplication, addition, or inclusion-exclusion you have used in each part.    Part A  The set A itself   Part B The set B a subset of A of strings of length 6 in which no elements are repeated   Part C The set C a subset of A of strings which contain the substring fab   Part D The set D a subset of A of strings which contain the substring fab or the substring feebb (or both)   Part E The set E of strings which contain either the substring fab or the substring baff (or both)

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.