Ghhh

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Across
  1. 4. A study
  2. 6. The simplest rudiments
  3. 7. A difficult task
  4. 8. The crisis of a disease
  5. 9. An order that something is to be reserved
  6. 10. A gentle bend
Down
  1. 1. In the end
  2. 2. Being very important
  3. 3. A series of interconnected things
  4. 5. An option