{[]string{"a", "b"}, ""},
		{[]string{"a", "a"}, "a"},
		{[]string{"a/", "a/"}, "a/"},
		{[]string{"abcd/", ""}, ""},
		{[]string{"abcd/foo/", "abcd/bar/"}, "abcd/"},
		{[]string{"abcd/foo/bar/", "abcd/foo/bar/zoo"}, "abcd/foo/bar/"},
	}

	for i, test := range testCases {
		foundPrefix := lcp(test.prefixes, true)
		if foundPrefix != test.commonPrefix {

    <magic priority="50">
      <match value="0x5A494D04" offset="0"/>
    </magic>
  </mime-type>
  <mime-type type="application/x-zoo">
    <magic priority="50">
      <match value="0xfdc4a7dc" type="little32" offset="20"/>
    </magic>
    <glob pattern="*.zoo"/>
  </mime-type>

  <mime-type type="application/x400-bp"/>
  <mime-type type="application/xcap-att+xml"/>