Fault Tree Analysis Symbols

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    I am working on a case and trying to map out the cause and effect relationship to a problem. For most cases, I encounter 1 effect will multiple causes and for the effect that requires 2 causes to happen in a specific sequence, a AND PRIORITY gate would be applied between the effect and 2 causes.

    However, my recent case is the reverse of the example above. I have 1 cause that will lead to 2 effects and the 2 effects will not happen at the same time. When the 1 cause happens, Effect A will occur immediately. If the cause continues to exist in the process for more than 2 days, then on top of Effect A, Effect B will occur as well.

    In this case, what is the symbols that I should use to construct the Fault Tree Diagram?

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