Ключевые слова: abbreviation, abc, abstract, acronym, alphabet, background, block, blocks, blue, character, clinical, color, concept, cube, cubes, cystitis, doctor, element, flank, health, idea, infection, information, kidney, letter, message, object, pain, sign, symbol, text, toy, tract, type, typography, urethra, urinary, urine, uti, white, wood, wooden, word,