Input (grade 13): According to Galen, these elements were used by Hippocrates in describing the human body with an association with the four humors: yellow bile (fire), black bile (earth), blood (air), and phlegm (water).
Output (grade 6): Galen said these elements were used by Hippocrates to describe the human body. The elements are linked to the four humors: phlegm (water), yellow bile (fire), black bile (earth), and blood (air).