The number of words in unixdict.txt = 25104
The rule "I before E when not preceded by C" is PLAUSIBLE
There were 465 examples and 213 counter examples, for a ratio of 2.1831
The rule "E before I when preceded by C" is NOT PLAUSIBLE
There were 13 examples and 24 counter examples, for a ratio of 0.541667
Overall the rule is NOT PLAUSIBLE