Improvements can be subtle.Logical formLearned from7 sentences. A mark can be subtle.Logical formLearned from7 sentences. An illumination can be subtle.Logical formLearned from7 sentences. (Surface features) can be subtle.Logical formLearned from7 sentences. Disputes can be subtle.Logical formLearned from7 sentences. (Warning signs) can be subtle.Logical formLearned from7 sentences. Rumblings can be subtle.Logical formLearned from7 sentences. A quirk can be subtle.Logical formLearned from7 sentences. Harm can be subtle.Logical formLearned from7 sentences. Praise can be subtle.Logical formLearned from7 sentences. Details can be subtle.Logical formLearned from7 sentences. Particles can be subtle.Logical formLearned from7 sentences. A strategy can be subtle.Logical formLearned from7 sentences. Interrelationships can be subtle.Logical formLearned from7 sentences. A delight can be subtle.Logical formLearned from7 sentences.