Find a series of words using the following clues:
1) The first word means "to
search blindly".
2) The second word is a fruit growing on vines. This word is formed
by replacing a letter in the first word with another letter.
3) The third word means "rating or
degree". This word is formed by
replacing a letter in the second word with another letter.
4) The fourth word means "to exchange
goods".
This word is formed by replacing a letter in the third word with another
letter.
Find these four words.
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