The which means "a difficulty" is mid-15c. Mathematical feeling of "proposition demanding some operation for being executed" is from 1560s in English. Challenge little one, one particular by which complications of a personal or social character are manifested, is recorded by 1916. Jackie is usually a writer and editor from https://kryt53197.blgwiki.com/665149/the_fact_about_sklo_that_no_one_is_suggesting