URL_PREFIX='http://poprzednia.univ.gda.pl/slang/hasla'
NTHREADS=10

def definitionLinks = "$URL_PREFIX/litery.html".toURL().text.findAll(/[a-z]\.html/).sum {
    ("$URL_PREFIX/$it".toURL().text =~ /<a href="([^"]+)" target="znaczenie".*/)*.getAt(1)
}
groovyx.gpars.GParsPool.withPool(NTHREADS) {
    definitionLinks.collectParallel {
        def text = "$URL_PREFIX/$it".toURL().getText('iso-8859-2')
        return [text.find(/(?<=<dt>)[^<]+/), text.find(/.+(?=<\/dd>)/)]
    }
}