Octave Challenge! (But no two notes are the same)

[Tests]

What do you mean by, "...But no two notes are the same?"

I'm sorry, I know that's really vague. I tried to explain the rules but I confused a few people, so I changed the title of the challenge, and that just made it worse. just look at this sample sequence: 
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Note that the entire range has no notes that are both Ds (or any other note), like D4 and D5 for example. That is what the range of an entry must be.

Oh, thanks for the clarification. I'll attempt to make something now