5 says 'for instance'. We must find the sentence that logically connects with 5. Also, we must connect the pronoun 'it' in sentence 4 with some noun. The pronoun cannot refer to the plural "models" in 1 or the plural 'algorithms' in 5. It can refer to the singular noun "hate speech detection" in 2. Thus 24 form a pair. Similarly, 1 and 5 form a pair because the example of 'human-like biases" in 1 can be found in 5 . Also, both the sentences speak about algorithms. Thus 2415 form a logical pair, and 3 is the odd one out.