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According to a coding scheme the sentence Peacock is designated as the national bird of India is coded as $5688999\;35\;1135556678\;56\;458\;13666689\;1334\;79\;13366$

This coding scheme has the following rules:

  1. The scheme is case-insensitive (does not distinguish between upper case and lower case letters).
  2. Each letter has a unique code which is a single digit from among $1,2,3,\dots,9$.
  3. The digit $9$ codes two letters, and every other digit codes there letters.
  4. The code for a word is constructed by arranging the digits corresponding to its letters in a non decreasing sequence.

Answer these questions on the basis of this information.

For how many digits can the complete list of letters associated with that digit be identified?

  1. $3$
  2. $0$
  3. $1$
  4. $2$
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