single controller single control single convention on narcotic drugs single convention single conversation single cookie single copy single core single corner single council single country single county single course single court single cover single crack single cream single creature single credit single criterion single crochet single crop single crown single crystal single culture single cup single currency requires single currency single curve single customer single cut single cycle single cylinder single dad single daily dose single dashboard single data file single database file single database single data single date single day single deadline single deal single death single debuted single decision single deck single declaration single definition single delay single delivery single deposit single design single desktop single desk single destination single detail single device single diamond single difference single digits single digit single dimension single dime single direction single directive single directory single discharge single discipline single disc single disease single dish single disk single display single distance single district single division single doctor single document single dog single dollar single domain single donation single donor single door single dosage single dose of the drug single dose pre-filled syringe single doses to a single dose single dose single dot single doubt single drawer single draw single dream single drink single driver single drive single drone single drop of blood single drop of water single drop single drug single drum single duvets single economic area single economic entity single economic single economy single edge single edition single effect single egg single electronic single electron single element single elimination single email single embryo single employee single employer single encounter single ended single end single enemy single engine single enterprise single entity single entrance single entry point single entry single envelope single environment single episode single equation single equipment single error single ester single euro payments area single european act single european airspace single european area single european country single european currency single european energy market single european market single european patent single european policy single european sky single european state single european system single european single evaluation single evening single event single examination single example single exception single exchange single exercise single experience single experiment single expert single explanation single exposure single expression single extension single external single eyewitness single eye single face single facility single factory single factor single fact single failed single failure single family house single family single fan single fare single farmer single farm single father single fault single feature single feed single fee single female single fiber single field single fight single figure single file single film single filter single financial framework single financial instrument