表示复数的s不是自由语素，必须附着于名词。
The plural 's' is not a free form, as it must always be attached to a noun.
词干可以是一个黏着词根、自由语素或者本身就是一个派生词。
A stem can be a bound root, a free morpheme, or a derived form itself.
规则4：单字单词的语素自由度的最大和。
Rule 4: Largest sum of degree of morphemic freedom of one-character words.
规则4：单字单词的语素自由度的最大和。
Rule 4: Largest sum of degree of morphemic freedom of one-character words.
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