Fear, rear ; sea, tea, lea ; seal, heal, meal ; fearing, fearful, fearless ; rearing ; seaman, seamanship ; sealing, sealed, healing ; heat, meat, beat, seat ; seam, beam ; beating, heating, seating ; heated, seated, retreated ; people, peopled, peopling; field, yield, wield, yielded, yielding ; deity, deist ; machine, routine, tontine, vaccine, marine, submarine, transmarine ; magazine, quaran tine, ultramarine.
It is also marked by — ea, speak ei or ie, yield, believe, eo, people i, machine.  Fear, rear ; sea, tea, lea ; seal, heal, meal ; fearing, fearful, fearless ; rearing ; seaman, seamanship ; sealing, sealed, healing ; heat, meat, beat, seat ; seam, beam ; beating, heating, seating ; heated, seated, retreated ; people, peopled, peopling; field, yield, wield, yielded, yielding ; deity, deist ; machine, routine, tontine, vaccine, marine, submarine, transmarine ; magazine, quaran tine, ultramarine.  Lesons on the Eighth Vowel Sound.