are ▁Book ▁and ▁Man us cript ▁Library . ▁It ▁is ▁also ▁applied ▁in ▁areas ▁such ▁as ▁vot er ▁registration , ▁where ▁Mac ▁and ▁Mc ▁names ▁may ▁be ▁sorted ▁together ▁in ▁a ▁listing . ▁Techn ically ▁this ▁is ▁a ▁convention ▁in ▁coll ation . ▁ ▁On ▁the ▁other ▁hand , ▁ASCII ▁is ▁a ▁computer ▁standard ▁and ▁its ▁corresponding ▁sorting ▁is ▁gradually ▁replacing ▁this ▁exception ▁to ▁ordinary ▁alphabet isation . ▁R ules ▁once ▁used ▁for ▁fil ing ▁have ▁been ▁dropped ▁for ▁some ▁newer ▁computer ▁systems , ▁and ▁the ▁inter fil ing ▁of ▁Mac ▁and ▁Mc ▁names ▁is ▁an ▁example , ▁according ▁to ▁a ▁ 2 0 0 6 ▁book . ▁ ▁There ▁are ▁in ▁fact ▁a ▁number ▁of ▁options . ▁In ▁addition ▁to ▁sorting ▁them ▁under ▁" Mac " ▁and ▁" Mc " ▁respectively ▁or ▁choosing ▁to ▁sort ▁them ▁both ▁under ▁" Mc ", ▁it ▁is ▁known ▁for ▁Mc / Mac ▁names ▁to ▁be ▁placed ▁in ▁position ▁before ▁M . ▁ ▁History ▁This ▁topic ▁has ▁a ▁complicated ▁and ▁dispar ate ▁history , ▁spread ▁over ▁different ▁contin ents ▁and ▁rel ating ▁to ▁different ▁areas ▁of ▁indexing , ▁catalog uing ▁and ▁fil ing . ▁The ▁idea ▁of ▁a ▁coll ating ▁sequence ▁itself ▁has ▁evol ved , ▁over ▁time , ▁and ▁the ▁" Mac ▁and ▁Mc " ▁together ▁example ▁has ▁been ▁taken ▁as ▁representative ▁of ▁a ▁possible ▁parad ig m . ▁ ▁Ob sole te ▁fil ing ▁rules ▁A ▁book ▁on ▁fil ing ▁rules ▁from ▁ 1 9 1 8 ▁gives ▁an ▁example ▁showing ▁Mc ▁and ▁M '