symbol in the Logic Tree. The OR Logic Gate is represented by the 
symbol in the Logic Tree.You can add logic gates to the Logic Tree to define a connection between nodes. A logic gate is defined in an RCA Logic Gate and is represented in the Logic Tree by a Logic Gate node. You can use Logic Gate nodes to add Boolean logic between nodes (i.e., AND and OR statements). The AND Logic Gate is represented by the symbol in the Logic Tree. The OR Logic Gate is represented by the symbol in the Logic Tree.
Adding a Logic Gate node between other nodes in the Logic Tree indicates a conditional relationship between the nodes, which you can define in the description fields in the RCA Logic Gate. These conditional relationships are defined in logical statements (e.g., if B is true, then A is true).
When two or more hypotheses are linked to a common predecessor node, the hypotheses nodes are by default connected using the OR Logic Gates, whether the Logic Gates are visible or not.
To add a Logic Gate node manually to the Logic Tree, you will need to enable logic gates and create an RCA Logic Gate.
Assume that you want to indicate in the Logic Tree that Failure Mode is true only if Hypothesis_1 and Hypothesis_2 or Hypothesis_2A is true.
You would organize the nodes in the Logic Tree as shown in the following image.
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