[REBOL] question about insert Re:(4)

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Thanks for everyone's answers.

Just wanted to reply to this:
"Also, in your examples, you've been inserting words into strings. Keep in
mind that a string is a series of characters, not a series of words."

All of my examples have been inserting strings into other strings. Quick
question though: what's the difference between these two things:

>> char? #'i'
== false
--- that is # (single quote) i (single quote)

>> char? #"i"
== true
--- that is # (double quote) i (double quote)

Thanks.