I think "else" is bound.

R5RS 3.1.
 > An identifier that names a type of syntax is called
 > a syntactic keyword and is said to be bound to that syntax.

R5RS 7.1.
 > <syntactic keyword> -> <expression keyword>
 >  | else | => | define
 >  | unquote | unquote-splicing

"else" is syntactic keyword, and syntactic keyword is bound to syntax.
Therefore, "else" is bound.
What do you think?

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