ometa multiword{
    isKeyword  :x  = ?multiword._isKeyword(x),
    letters        = letter+:l                                            -> l.join(''),
    word           = letters:w                                            -> {kind: 'word', value: w},
    scanner        = space* word,
    token :k       = scanner:t ?(t.kind==k)                               -> t.value,
    keyword        = "word"+:k isKeyword(k.join(' '))                     -> ['keyword', k.join(' ')],
    verb           = ("word":k ~isKeyword(k) -> k)+:l                     -> ['verb', l.join(' ')],
    expr           = keyword:k ',' verb:v ',' keyword:e                           -> [k, v, e]
}

multiword.keywords  = {}

keywords = ["one", "two or more"]
for (var idx = 0; idx < keywords.length; idx++){multiword.keywords[keywords[idx]] = true}
multiword._isKeyword = function(k) { return this.keywords.hasOwnProperty(k) }

sentence = 'one, can have, two or more'

multiword.matchAll(sentence, 'expr')