at an improper time
131Contra dance — Contredanse redirects here. For the Belarusian folk music band, see Contredanse (band). For the early and middle Western Classical music form, see Classical period (music). Contra dance (also contradance, contra dance and other variant spellings) …
132Data Encryption Standard — The Feistel function (F function) of DES General Designers IBM First publis …
