The term 'arrange systematically' can be broken down into four crossword solutions: SORT (4 letters), ORGANISE (8 letters), organize (8 letters), and CODIFY (6 letters). SORT means to arrange items in a particular order, such as alphabetically or numerically. ORGANISE and organize mean to put things in order, often by grouping them together. CODIFY means to arrange information into a system of rules or laws. All of these words refer to the act of arranging items in an orderly fashion.