An adverb can also take a fixed number of arguments or even a variable
number of arguments using a sentinel (a good use of [:) in the same
fashion. Moreover, the adverb can be defined tacitly and it is not too
difficult if one is willing to come to the dark side ;)
See the adverbs sna and Recur d
A conjunction that parses both its parameters on the left, I call a double
adverb. It is fairly easy to convert any named conjunction to use this
parsing, and it has several neat properties.
http://www.jsoftware.com/jwiki/PascalJasmin/double%20adverbs%20vs%20conjunctions
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