d-loop dododo dollon dollop dollup dololo dolool doloop dondon donlon doudou doulou duddon duldul duloup dulpod dululu dundun dunlop dunoon duolun duplo- loddon lollop london lonnol looloo loplop loudon loudun loulon loulou lunlun nnundu non-no non-op nonodd nonold nonono nonoon noonoo nopulp nounou null-o oooooo ouolon plonno polpol poopoo pop-up popduo popopo poppop populo poupon poupou pppppp pullno pullon pullup punpun udullu undull unloop unlull unu-op uponon