pie字根列表
https://www.thefreedictionary.com/_/roots.aspx?type=Indo-European
https://www.etymonline.com/word/*okw-#etymonline_v_52718
["(s)keu-","(s)mer-","(s)pen-","(s)teg-"]
["ad-","ag-","agh-","agro-","aik-","aim-","aiw-","ak-","akwa-","al-","ambhi-","ane-","angh-","ant-","*apo-"]
["bha-","bhag-","bhau-","bheid-","bheidh-","bhel-","bhendh-","bher-","bhereg-","bhergh-","bheudh-","bheue-","bheug-","bhle-","*bhorh-"]
["da-","deik-","dek-","dekm-","deks-","dem-","dent-","der-","deru-","deu-","deuk-","dhe(i)-","dhe-","dheigh-","*dheigw-"]
["ed-","ei-","ekwo-","el-","em-","en","er-","ere-","es-","eu-","*eue-"]
["g(a)lag-","gal-","gel-","gembh-","gene-","genu-","ger-","gere-","geus-","ghabh-","gheim-","ghel-","ghend-","gher-","*ghere-"]
["ka-","kad-","kae-id-","kakka-","kan-","kand-","kap-","kaput-","kar-","ked-","keg-","kei-","keie-","kel-","*kele-"]
["leg-","legh-","legwh-","leig-","leigh-","leikw-","leip-","leu-","leubh-","leue-","leuk-","lois-"]
["mag-","magh-","maghu-","mak-","man-","me-","med-","medhyo-","meg-","mei-","meigh-","meik-","mel-","mele-","*melg-"]
["nas-","nau-","ne-","nebh-","ned-","nek-","nem-","ner-","neu-","no-men-"]
["oi-no-","okw-","op-","ost-"]
["pa-","paewr-","pag-","pau-","ped-","peig-","pekw-","pel-","pele-","penkwe-","per-","pere-","pet-","pete-","*peuk-"]
["re-","red-","reg-","rei-","reig-","reudh-"]
["sa-","sal-","sawel-","sed-","segh-","sek-","sekw-","sem-","sen-","ser-","skei-","skel-","sker-","skeud-","*skoto-"]
["tag-","teks-","tem-","ten-","tere-","terkw-","ters-","teue-","teuta-","tkei-","tolkw-","trep-"]
["uper","upo"]
["wal-","we-","wed-","weg-","wegh-","wei-","weid-","weik-","weip-","wekw-","wel-","wen-","wer-","were-o-","*werg-"]
["ye-","yeug-"]
PIE roots.txt
PIE roots lines.txt