prompt: Q: How much is 81 minus 50? A: 
random_counterfactual.prompt: Q: How much is 59 minus 15? A: 
ones_op1_counterfactual.prompt: Q: How much is 82 minus 50? A: 
ones_op2_counterfactual.prompt: Q: How much is 81 minus 50? A: 
tens_op1_counterfactual.prompt: Q: How much is 91 minus 50? A: 
tens_op2_counterfactual.prompt: Q: How much is 81 minus 70? A: 
ones_carry_counterfactual.prompt: Q: How much is 90 minus 59? A: 
tens_carry_counterfactual.prompt: Q: How much is 81 minus 50? A: 