Consider the following premises. Patricia is a bartender. If Patricia were a bartender, then Linda is a nurse. David is not a server or Robert is making tea. If Linda were a nurse, then David is a server. Can we infer the following from them? Susan is playing squash or Robert is making tea.
 From the fact that if Patricia were a bartender, then Linda is a nurse, and that if Linda were a nurse, then David is a server we can infer that if Patricia were a bartender, then David is a server. From the fact that if Patricia were a bartender, then David is a server, and that Patricia is a bartender we can infer that David is a server. From the fact that David is a server we can infer that David is a server or Susan is playing squash. Finally, from the fact that David is a server or Susan is playing squash, and that David is not a server or Robert is making tea we can infer that Susan is playing squash or Robert is making tea. Therefore, the answer is yes.