beeps ebeps beeps ebeps eebps eebps bepes ebpes bpees pbees epbes pebes bepes ebpes bpees pbees epbes pebes eepbs eepbs epebs peebs epebs peebs beesp ebesp beesp ebesp eebsp eebsp besep ebsep bseep sbeep esbep sebep besep ebsep bseep sbeep esbep sebep eesbp eesbp esebp seebp esebp seebp bepse ebpse bpese pbese epbse pebse bespe ebspe bsepe sbepe esbpe sebpe bpsee pbsee bspee sbpee psbee spbee epsbe pesbe espbe sepbe psebe spebe bepse ebpse bpese pbese epbse pebse bespe ebspe bsepe sbepe esbpe sebpe bpsee pbsee bspee sbpee psbee spbee epsbe pesbe espbe sepbe psebe spebe eepsb eepsb epesb peesb epesb peesb eespb eespb esepb seepb esepb seepb epseb peseb espeb sepeb pseeb speeb epseb peseb espeb sepeb pseeb speeb
Note: these 'words' (valid or invalid) are all the permutations of the word beeps. These words are obtained by scrambling the letters in beeps.