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import sgmllib
import re

class MyParser(sgmllib.SGMLParser):
    def __init__(self, verbose=0):
        sgmllib.SGMLParser.__init__(self, verbose)
        
        self.hyperlinks = []
        self.url_reg = re.compile('res/\d+\Z')
        self.prev = ""
        
    def parse(self, s):
        self.feed(s)
        self.close()

    def start_a(self, attributes):
        for name, value in attributes:
            if name == "href":
                if self.url_reg.search(value) != None:
                    if self.prev != value:
                        self.hyperlinks.append(value)
                        self.prev = value
    
    def get_hyperlinks(self):
        return self.hyperlinks

class MySubParser(MyParser):
    def __init__(self, verbose=0):
        MyParser.__init__(self, verbose)
        self.url_reg = re.compile('/src/\d+\.\w{3,4}\Z')