lumen - You're correct, the phrase omits some letters and duplicates others.
I attempted to deal with the misleading sentence in the preamble in an earlier post, I'll have another go -
The contents of 'the phrase' as a physical entity includes 11 or 12 items - not the phrase itself (5 words).
I took a guess at the first two coded words of the instructions, they are what you'd normally expect to be told to do.