in Combinatory
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How many $4$-element $RNA$ sequences

  1. contain the base $U?$ 
  2. do not contain the sequence $CUG?$ 
  3. do not contain all four bases $A, U, C,$ and $G?$ 
  4. contain exactly two of the four bases $A, U, C,$ and $G?$
in Combinatory
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