prompt: Q: How much is 66 minus 39? A: 
random_counterfactual.prompt: Q: How much is 87 minus 35? A: 
ones_op1_counterfactual.prompt: Q: How much is 69 minus 39? A: 
ones_op2_counterfactual.prompt: Q: How much is 66 minus 33? A: 
tens_op1_counterfactual.prompt: Q: How much is 46 minus 39? A: 
tens_op2_counterfactual.prompt: Q: How much is 66 minus 19? A: 
ones_carry_counterfactual.prompt: Q: How much is 67 minus 30? A: 
tens_carry_counterfactual.prompt: Q: How much is 66 minus 39? A: 