<prompt> Translate the following text to SwahiliSuch deviations were required to be documented in a letter and, though not required, were usually approved by the central security group.  <response>: Mapungufu hayo yalihitajiwa kuandikwa katika barua na, ingawa hayakuhitajika, kwa kawaida yaliidhinishwa na kikundi kikuu cha usalama. 