one-one
one-person
one-player
one-price
one-product
onerous
oneself
one-server
one-shift
one-shop
  one-shot
one-sided
one-sigma
one-stop
one-tailed
one-time
onetime
one-time-basis
one-time-only
one-to-one
one-way

    one-shot tax refund

    разовая скидка с налога