The term 'USE LOGIC' can be broken down into three crossword solutions: REASON (6 letters), INFER (5 letters), and DEDUCE (6 letters). Reasoning is the process of using logic to draw conclusions from given information. Inference is the act of drawing a conclusion based on evidence and reasoning. Deduction is the process of logically arriving at a conclusion based on facts or premises. All three of these terms are related to the concept of using logic to make decisions or draw conclusions.