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"I before E, except after C" is a mnemonic rule of thumb for English spelling. If one is not sure whether a word is spelled with the digraph ei or ie, the rhyme suggests that the correct order is ie unless the preceding letter is c, in which case it is ei. For example:
  • ie in believe, fierce, collie, die, friend
  • ei after c in receive, ceiling, receipt, ceilidh
The rule is very well known; Edward Carney calls it "this supreme, and for many people solitary, spelling rule".

The rule is sometimes taught without regard for the particular sound represented by the spelling, and sometimes taught as applying only to particular pronunciations. Two common restrictions are:
  • excluding cases where the spelling represents the "long a" sound (the lexical sets of FACE // and perhaps SQUARE /ɛər/). This is commonly expressed by continuing the rhyme "or when sounding like A, as in neighbor or weigh"
  • including only cases where the spelling represents the "long e" sound (the lexical sets of FLEECE // and perhaps NEAR /ɪər/ and happY /i/).
However, whichever version of the rule is used, there are exceptions, such as caffeine, policies, seize, species and weird. Some words are exceptions under some versions of the rule but not others, such as leisure and rottweiler. Other words, such either, may or may not be exceptions depending on both which version of the rule is used and how an individual pronounces them. Some authorities deprecate the rule as having too many exceptions to be worth learning.

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