An user English
says…

Let
Verb
  W
Pronoun
  be
Auxiliary
  drawn
Verb
  uniformly
Adverb
  over
Adposition
  this
Determiner
  set
Noun
  as
Adposition
  an
Determiner
  index
Noun
.

Let W be drawn uniformly over this set as an index.
Words and sentences
New
let

New
W

New
be

New
drawn

New
over

New
as

New
an

New
index

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