center-fire city-center citycentric eigenenergy engeneering engineering eternifying fifty-fifty fifty-niner fiftycenter fire-engine freetricity frenigerent fritiniency geiteryggen genetierney gentrifying greenenergy greenfinger greenifying inefficient inenergetic inertinitic inferencing interferent interfering interfinger intergerine internecine interregent irreticence net-centric ngiri-ngiri nicey-nicey ninety-nine niningerite nittygritty re-engineer re-entering recentering referencing refrigerent refringence refringency reigning-in reinfecting reinterring rereferring rin-tin-tin ring-finger ringfencing ter-terrify