In the above form the Expression parameter is evaluated and the result is discarded. Normally, the Expression parameter uses the assignment operator = to
perform an assignment that saves the result (e.g. <let a = a + 1>).
When used after a semicolon the keyword let can be omitted.
(e.g. <while x < 10; x = x + 1; /while>)
The let Tag is Case Sensitive, which means heitml will not recognize it if you use capital letters (e.g. <LET Expression>).
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