- At least five red signs and at most nine red signs are visible from Amy’s window.
- If #1 has the same character visible as #9, then #2 has the same character visible as #4.
- If #6 and #8 show the same character, then sign #13 is red.
- If sign #1 has an R, S, or T visible, then there are exactly seven distinct characters visible.
- If sign #11 shows a letter in the second half of the alphabet, then sign #10 shows an R.
- If sign #2 and sign #5 are different colors, then sign #10 shows a D.
- If sign #2 and sign #5 are the same color, then sign #11 shows a C.
- If sign #3 and #9 have different characters visible, then one of those letters is an O.
- If sign #3 and sign #4 are the same color, then sign #13 shows a consonant.
- If sign #4 is purple, then sign #5 is red.
- If sign #4 is red, then sign #1 shows a letter in the second half of the alphabet.
- If sign #7 shows a G, H, I, J, or K, then sign #8 shows N or O.
- If sign #9 and sign #10 both show vowels, then #11 shows either a B or an X.
- Both #3 and #11 show letters. If the letter on #3 comes after the one on #11 alphabetically, then #2 shows a space character.
- If there is an odd number of purple signs visible, then sign #9 has S visible.
- Sign #1 has an A, I, S, or U visible.
- Sign #12 has an A visible.
- Six of the signs have vowels visible.
- The number of red signs is equal to the number of Es visible.
- The number of Rs visible is either zero or two.
- There are at least six and at most twelve distinct characters visible.
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- If sign #10 shows a vowel, then sign #13 shows a K or L.
- If sign #12 shows B, E, or T, then signs #6 and #7 show adjacent letters of the alphabet.
- If sign #12 shows one of the first three letters of the alphabet, then signs #1 and #6 show adjacent letters of the alphabet.
- If sign #13 shows an I, J, or K, then sign #2 shows an ampersand or the letter U.
- If sign #13 shows an L or M, then sign #8 shows an N or O.
- If sign #2 shows a letter of the alphabet, then sign #5 shows a hyphen.
- If sign #2 shows a vowel, then sign #3 shows a vowel as well.
- If sign #5 does not show C, then sign #2 shows a letter in the first half of the alphabet.
- If sign #5 shows a non-letter symbol, then sign #12 shows an H, T, or Y.
- If sign #6 shows H, O, P, or E, then sign #12 does not show C.
- If sign #7 is red, then sign #12 shows one of the first five letters of the alphabet.
- No even-numbered sign shows the letter J, Q, or X.
- Of the five letters D, O, U, B, and T, exactly two of them appear on the visible side of a sign (possibly multiple times each).
- The letters E and K are never adjacent.
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