0As a replacement for "difficult," "hard" is 01i 01u 00casual02u 02i 00. (1. & 2.
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Hard and Difficult are NOT interchangeable words
example: you can say that the table is HARD, however you cannot say that the test is HARD because if you were to put the word DIFFICULT where the word HARD is, you would come out with a sentence saying that the table is difficult, which is not a working sentence.
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