Employees at a company are randomly assigned certain shifts during the busy holiday season. Let A = the shift between the hours of 8 a.m. and 12 p.m., and B = the shift between the hours of 12 and 4 p.m. If the shifts are assigned with the following probabilities: P(A)=0.28; P(B)=0.83; P(A OR B)=0.93. What is the probability that an employee will randomly be assigned both shifts?