Frequence and sequence crossword

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Across
  1. 2. something with no possibilities of happening
  2. 4. something that has a remote possibility of happening, you can't use this with negative verbs.
  3. 5. that has a 50/50 chance of happening
  4. 7. an action occurring after another one
Down
  1. 1. the last action of a sequence
  2. 3. The action that starts a sequence
  3. 6. an action occurs IMMEDIATELY after another one
  4. 7. something that occurs without doubt