AC AF CPS DC EHF HF Hz Indian file Kekule formula MF O Platonic year RF SHF UHF VHF VLF absorption current active current aeon age alternate alternating current ambit annular muscle annulus annus magnus areola array arsis articulation atomic cluster audio frequency aureole bank be here again beat benzene ring bicycle bicycle-built-for-two bike bout branched chain bus buzz carrier frequency catch a train catena catenation chain chain reaction chaining chaplet chauffeur chopper circle circuit circuiteer circulate circumambulate circumference circummigrate circumnavigate circumvent circus close the circle closed chain closed circle come again come and go come around come full circle come round come round again come up again compass compound radical concatenation conduction current connection consecution continuum convection current corona coronet course crown cycle of indiction cycles date day delta current descent describe a circle diadem diastole dielectric displacement current direct current discus disk displacement current downbeat drive drone eddy current electric current electric stream emission current encircle encompass endless belt endless round entrain eternal return exciting current extremely high frequency fairy ring file filiation flank free alternating current frequency frequency spectrum full circle galvanic current gamut garland generation girdle girdle the globe glory go about go around go by rail go round go the round gradation great year gyre halo hertz heterocycle high frequency high-frequency current homocycle hum idle current indiction induced current induction current intermediate frequency intermit ionization current iron joyride juice kilocycles kilohertz lap lasso lattice line lineage logical circle loop looplet low frequency low-frequency current lower frequencies magic circle magnetizing current make a circuit make a train medium frequency megacycles megahertz minibike molecule monocycle monotone motocycle motor motorbike motorcycle multiphase current nexus noose orbit oscillate pattern pedal pedicab pendulum periodicity pig plenum powder train progression pulsate pulsating direct current pulse queue radical radio frequency radius range rank reactive current reappear recur recurrence recycle reoccur repeat reticulation return revolution revolve ride ring road-bike roll around rondelle rotary current rotate rotation round round trip roundel rounds routine row run saucer scale scooter sequel sequence series side chain sidewalk bike simple radical single file single-phase alternating current skirt space-lattice spark frequency spectrum spell sphincter spiral straight chain stray current string