vb.net - How can I remove the repeated lines in my output? -

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if arrysentence.contains(inputstring)     dim index integer = array.indexof(arrysentence, inputstring)      until >= arrysentence.getupperbound(0) + 1         dim position integer = index + 1         index = array.indexof(arrysentence, inputstring, position)          console.writeline("the word ""{0}"" @ position {1}.", inputstring, position)         = + 1     loop

it's done problem output repeats of lines like:
please enter sentence
apple fall apple tree
word apple @ position 2
word apple @ position 6
word apple @ position 2
word apple @ position 6

help!

i not understand reasoning behind loops. want following: search word in array. if exists, print position. otherwise exit. start over.

here how it:

dim index integer = array.indexof(arrysentence, inputstring) while index >= 0 'while word has been found     'output occurrence     console.writeline("the word ""{0}"" @ position {1}.", inputstring, index + 1)     'search next occurrence     index = array.indexof(arrysentence, inputstring, index + 1) end while

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