How many of the following pairs are exactly alike? (1) Ref. QX-4471-B | Ref. QX-4471-8; (2) Ref. MN-2039-A | Ref. NM-2039-A; (3) Ref. TR-5560-C | Ref. TR-5506-C; (4) Ref. LP-1182-D | Ref. LP-1182-O; (5) Ref. GH-9034-E | Ref. GH-9034-F
Correct answer: A. 0
0 of the five pairs are exactly alike: (1) differs at "1-B" vs "1-8"; (2) differs at ". MN-2" vs ". NM-2"; (3) differs at "5560-C" vs "5506-C"; (4) differs at "2-D" vs "2-O"; (5) differs at "4-E" vs "4-F". Check each pair one character at a time, from left to right, without skipping punctuation.
hard