Skip Chain

  The program requires one or more of several alternative behaviors. The choice or choices are indicated by conditions that are easily checked.  Therefore:
Check for each condition in turn. When absent, skip over the code that handles that condition. Let handlers fall into the next check. Or, if only one condition is possible, have the selected handler jump beyond the remaining checks.
  Skip chains are often order with the most urgent or highest frequency checks first.

PDP-8 Simulator
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