Doreen,
You may be confusing the following. The first position of the four-letter code is either I for introvert or E for extrovert. In fact, there are far more introverts that responded. Isn't that interesting?!
It's the second position that relates to either iNtuitive (N) or sensing (S). All the sites I've seen always capitalize the "n" in "intuitive" to indicate that's the letter used rather than the "i" because that is used for introvert.
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