pairs apirs piars ipars aiprs iaprs paris apris prais rpais arpis rapis piras ipras prias rpias irpas ripas airps iarps arips raips iraps riaps paisr apisr piasr ipasr aipsr iapsr pasir apsir psair spair aspir sapir pisar ipsar psiar spiar ispar sipar aispr iaspr asipr saipr isapr siapr parsi aprsi prasi rpasi arpsi rapsi pasri apsri psari spari aspri sapri prsai rpsai psrai sprai rspai srpai arspi raspi asrpi sarpi rsapi srapi pirsa iprsa prisa rpisa irpsa ripsa pisra ipsra psira spira ispra sipra prsia rpsia psria spria rspia srpia irspa rispa isrpa sirpa rsipa sripa airsp iarsp arisp raisp irasp riasp aisrp iasrp asirp sairp isarp siarp arsip rasip asrip sarip rsaip sraip irsap risap israp sirap rsiap sriap
Note: these 'words' (valid or invalid) are all the permutations of the word pairs. These words are obtained by scrambling the letters in pairs.