a - refers to: 1 ) first letter of the Spanish alphabet - 41-2; in chemistry, represents the atomic mass - 41 3; It is one of the types of vitamins-41-4; It is one of the four fundamental blood groups - 5 ) It is the first side of a vinyl-41-6 record; in football, in some countries, means '' first division '' - 7 ) inside parentheses, and lowercase means '' alias ''. -Vitamin A or retinol is a substance indispensable for human life-
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