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Are you always going to want to insert characters in the second, sixth and second to last place?
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Are you always going to want to insert characters in the second, sixth and second to last place?

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<div class="content wysiwyg-content">
the4string<br />
want <br />
th2e4sxtrin2g<br />
<br />
adding 2x2<br />
<br />
longstring<br />
want<br />
lo2ngsxtrin2g
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the4string
want 
th2e4sxtrin2g

adding 2x2

longstring
want
lo2ngsxtrin2g

adding a 3 digit string to another string

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