Perform a single tier reduction of a range of rule elements. eg. If finding a period to be end-of-sentence in context, we only want to reduce the period to end-of-sentence, not the whole context.
number1 - type: int
number2 - type: int
# Reduce the _det and _noun to an _np, but
# not the node that matched element 3.
_np <- _det _noun _xWILD [one fail=(_noun)] @@
single, singlex, singlezap, noop, POST Actions