Mathematician: 3 is a prime, 5 is a prime, 7 is a prime, 9 is not a prime - counter-example - claim is false. Physicist: 3 is a prime, 5 is a prime, 7 is a prime, 9 is an experimental error, 11 is a prime, ... Engineer: 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime, 11 is a prime, ... Computer scientist: 3's a prime, 5's a prime, 7's a prime, 7's a prime, 7's a prime, ... Computer scientist using Unix: 3's a prime, 5's a prime, 7's a prime, segmentation fault

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