clear as a bell vs lucid

clear as a bell

adj

  • Totally clear; distinct and unmistakeable, as a bell's tone is clearly heard. 

lucid

adj

  • clear; easily understood 

  • bright, luminous, translucent or transparent 

  • mentally rational; sane 

noun

  • A lucid dream. 

How often have the words clear as a bell and lucid occurred in a corpus of books? (source: Google Ngram Viewer )