Let A=\{2,3,6,7\} and B=\{4,5,6,8\}. Let R be a relation defined on A \times B by (a_1, b_1) R (a_2, b_2) is and only if a_1+a_2=b_1+b_2. Then the number of elements in {\R} is ________. [9 Apr 2024 Shift 1]

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