NB. Text that follows 'NB.' has no effect on execution.

0 : 0
Multi-line comments may be placed in strings,
like this.
)

Note 'example'
Another way to record multi-line comments as text is to use 'Note', which is actually
a simple program that makes it clearer when defined text is used only to provide comment.
)

'A simple string which is not used is legal, and will be discarded'