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var := WORD index word0 [ … wordn ]

Calling the STx command WORD with the integer argument index will return its argument wordindex, provided index is in the range of 0…n. If it is not, the STx command will return the empty string.

The zero-based index of the argument ("word") to return (0 ≤ in).
word0 [ … wordn ]
a list of string arguments, separated by blanks

See also the STx command KEYWORD.