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Earth's Rotation Day is observed annually on January 8th. This day marks the anniversary of the demonstration by French Physicist Leon Foucault in 1851, which visually showed Earth's rotation through the use of a pendulum, providing concrete evidence to support earlier theories.
How many such pairs of letter are there in the word INGREDIENTS, each of which has as many letters between them in the word as in the English alphabet?
If we add ‘1’ to all the even digits of the number 7328786493478, then, which digit(s) appears, more than twice after the rearrangement?