Crystals can be blue.Logical formLearned from111 sentences. Crystals may pertain-to a female.Logical formLearned from110 sentences. Crystals may pertain-to a person.Logical formLearned from109 sentences. A crystal can be blue.Logical formLearned from104 sentences. Crystals can be beautiful.Logical formLearned from104 sentences. Crystals can be clear.Logical formLearned from96 sentences. A crystal can be clear.Logical formLearned from96 sentences. Crystals can be black.Logical formLearned from90 sentences. Crystals may form.Logical formLearned from86 sentences. Crystals may pertain-to a us-state.Logical formLearned from79 sentences. A crystal can be green.Logical formLearned from77 sentences. Crystals can be green.Logical formLearned from76 sentences. Crystals can be microscopic.Logical formLearned from76 sentences. Crystals can be constituted-of-or-filled-with ice.Logical formLearned from76 sentences. Crystals can be organic.Logical formLearned from71 sentences.