2.1.php

<?php
$input = <<<EOT
naosmkcwtdbfivxuphzweraljq
nvssmicltdbfiyxuphzgeraljq
nvosmkcwwdbfiyxuphzeeraljx
nvosmkcqtdbfiyxupkzgeraljw
qvosmkcwtdbhiyxuphzgeraljh
nvocqkcktdbfiyxuphzgeraljq
nvosmhcwtdbfiyxmphzgekaljq
nvosmkcwtdbfuyxwpszgeraljq
nvosmocwtcbfiyxupfzgeraljq
nvosmkcwtdbfiyxubczgeraljv
nvosmkswtdbfiyxuphzgeruejq
nlosmkcwtqbfiyxuphzgyraljq
nvosmkcwtdbficxuphzgwraljk
nvosmkkwtdbfiyxxphzgeralcq
vvosmkcetdbfiyxumhzgeraljq
evosmkcdtdbfiyxuphkgeraljq
nvosmkvwtdbkiyxuphzgeraejq
nvoszkcwtdbfimxuphzgeraljb
nvozmkcwtdbfiyxuphzgrrcljq
nvosvacwtdbfiyxuphzgeralzq
nvosmkcwgdofiyxuthzgeraljq
nvosmkcwasbfiyxuphzgeradjq
nvosmkcatobfiyxtphzgeraljq
nvosmkewtdsfiyxuphzgekaljq
tvormkcwtdbfiyxuphzieraljq
nvosgkcwtdbfiyxuuhzgeraqjq
nvosmkcwtdbqiwxuphzgeralvq
nvosmkcwtybfiydcphzgeraljq
nvosnkcwtdbfiyxuphzulraljq
nvosmkcwtdbbiyuupnzgeraljq
nvosmwcwtdbfiyxuphzneraojq
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nvosmgcstdbfiyxuphzgeraljd
nvoswkcwtsbziyxuphzgeraljq
nvosmmcwtdbfiyxupbzzeraljq
nvosmkcwtdbfifxulhzgeralji
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lvnsmkcwtdbfiyxuphzzeraljq
nvqsmkcwtdbfiyxuphageralfq
nvosmkcwtdmfiyluphzgeralzq
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naosmkcwtdbfsyxuphzgsraljq
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nvosmkcwtdbliyxuphzgmraljx
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nvosmkcwwdbfiyxumhzgiraljq
cvosmscwtdbfikxuphzgeraljq
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nvosmkcwtdbfidxpphzgeraajq
nvosmkcwtdbfiyxuqhzgurcljq
nvosmkcwtekfiyxrphzgeraljq
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nvosmkcdtdbfhyxsphzgrraljq
nvolmkkwtdbfiyxuphzgeralgq
nvosmrcwtdbfiyxuphzgefkljq
nvoxmkcwtdbfiysuphzeeraljq
nvjsmkswtdbfiyxuphzqeraljq
nvosmkcetdbfiyfuphdgeraljq
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nvosdgcwtdbfiyxupyzgeraljq
nvosmkcwudbfiyzvphzgeraljq
nvosmkcwtlbfiyxupkzgerzljq
nvosmkcwtdbfiywuphyzeraljq
nvocmkcwtdufiyxukhzgeraljq
nvosmkcwtdqfiyxuphzgevaxjq
nvosvkcwtdbgiyxuphzgeralzq
nqosmkcwtdbfiyxuphzeeraljr
nvosmkcetdbfiyxuphzgeroljo
nvosmkcwtdvfiyxuphzceraliq
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nvosmkfwtdefiyxupxzgeraljq
nvosmacwtdbfiyxuphzseragjq
nvpsmkcwtdbfzyxuvhzgeraljq
nvormkcwtdbfiyxuphzairaljq
rvysmkcwtdbfmyxuphzgeraljq
nvosmscwzdbfiyxuphzgerbljq
nvosmkcwtdufmyxuphzqeraljq
nvosmkcwtxbfiyxxphzgeralxq
nvosmkcwtdbsiyxupsfgeraljq
nvosmccwtdbfiqxuthzgeraljq
nvosmtcwtqbuiyxuphzgeraljq
nvosmkcwtdbfiysurbzgeraljq
nvowmkcwtdbfiyxuywzgeraljq
xvosmkcktdbfiyxuhhzgeraljq
nvosmkgwsdbfiyxmphzgeraljq
jvofmkcwtdbfiyxupyzgeraljq
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nvosmkcptdbfiyxuphzgepaljn
nvosmkcwtdbpiyxuphzgeraxjw
nvoszkcwtdbfiyjuphzeeraljq
nvosmkcwtdbfiyxuppzoeraejq
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nvosmecwtdofiyxuphzgeralja
nvosmkqwtdbfixxuphzgeraojq
nvosmkwwtdbfiyxfpdzgeraljq
nvosmkgwtdbfiyzupwzgeraljq
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nvosmdcwtdbmiyxuphzveraljq
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nvosmmcwtdlfbyxuphzgeraljq
nvosmkcwtabmiexuphzgeraljq
nvosqpcwtdbfiyxuphzgqraljq
nvosmecwjdbfiyxuphzgeraljk
nyohmkcwtdbfiyxuphzgzraljq
nlosmkcwtkbfiyxuphzgeraejq
nvosmkcwrdbliyxuphzgerpljq
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nvosmkcwtdbfiyxuhizgerazjq
nvosmkhptdbfbyxuphzgeraljq
nvosmfcwtdbgiyxupdzgeraljq
nvosmkmwtdbfiyxuphzgevalpq
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nvosmkcwjwbfiyxuphzgeualjq
nvosmkcwxdbflymuphzgeraljq
nvosmkcwpdbriyxuphzoeraljq
nvoshkcwcdbfiyxuphzgeravjq
nvosmkcetcbfiyxgphzgeraljq
nvosmkcwtdyfiyxuphzgerwqjq
nuosmkcwedbfiyxurhzgeraljq
nvosmkcwtdbfiixuphzctraljq
nvoszkcwtdbfwyxuphzgerpljq
nvormkcwtdbfiyxuphzgeralzn
nvosmkyttdbfiywuphzgeraljq
nvosmkcwtdbhiyxupazgeralhq
nvotmkcwtdbfiyxuphzgevalbq
nvosmkcwedbfiyxuphzguraljr
nvssmkcwtdbfiyxushzgeralbq
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nvogmkcwtdbfiyxuphzgerrxjq
ncormkcwtdbfiyxuphzgeraloq
nvosmkcwbdbfiyeuphzgerqljq
nvosxkcwtdbfsyxupfzgeraljq
nvohmkcwtdbfiyxuphzseraajq
nvoscdcwtdbfiyxuphzgeralqq
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nvosmkcwtwbfiyxuphzgehamjq
nvosmkcwtdbfiyxushzgejaljv
nvosmkcwodbfiyxuphzgeryqjq
nvoymqcwtdbfiyxuphzgeralbq
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nvjsmdcwedbfiyxuphzgeraljq
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nvrsmkcwtdifiyxuphzgqraljq
nposmkcwtdbfiyxiohzgeraljq
dvosmkcwtdbfiyxuphzrvraljq
pvosmkcwudbfsyxuphzgeraljq
noosmkcwtdbfiyxuphtgexaljq
nvosmkcwtdbfiaxuphyferaljq
nvhsmlcwtdbfiyxuphzgeualjq
nvosekcwtdbbiyxuphzgerabjq
nvosvkcitdbfiyxuphzgerarjq
nvotmkkwtdbfiyxuphzgeraljj
nvosmecwtdbfiyxuphzgyralwq
hvosmkcwtdbfiyxuphzysraljq
nvosmkcvtdbfiyxlphzgeraljb
nvosmkcwttbfiyxuphngtraljq
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nxosmkcwtdbfibxuphzgrraljq
nvokmkhwtdbfiyxuphzgwraljq
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nvosmkcwtdcfiaxuphzeeraljq
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nvosmkcwtdbiiyxuahzieraljq
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nvonmkcutdbfiyxuphzieraljq
nvocmkcwtdbfiyyuphageraljq
nvosmkcwtdbfoyxuphzneraqjq
nvoskkcwtdbtiyxuphzgevaljq
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nyosmhcwtdbfiyxuphzgereljq
nvosmncwtdbfietuphzgeraljq
gvpsmkcwtdbfiyxuyhzgeraljq
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nvostkcltpbfiyxuphzgeraljq
nvosmkcwtdbdiyxuphzgehaljz
nvosmkcwtjbziyxuphzgexaljq
nvosmkcwtdbfiyptphzggraljq
nvosmkcwtdbliyxupjzgebaljq
nvosmkawtdbfiyxupxzgtraljq
vvosmkcwtdbfiyxfphzperaljq
nvosmkawtdbfiyxutczgeraljq
nvosmkcbtdbuiyxrphzgeraljq
nvbsmkcwtdbfiyxdphzgerasjq
nvosnkcwqdsfiyxuphzgeraljq
nvosmkcwtdbfiyxwphzgzzaljq
nvosmkcwtdbffyquphzgeralcq
nvosmkcwtzbfiyxdphzgzraljq
nvysmkcwtdbfiycvphzgeraljq
nvowmkcwtdbfiycuyhzgeraljq
nvosbkcwtdbfiyiuphzgeraqjq
nvosmecwtdbfiyxupqzmeraljq
nvosmkcdtdbfhyxsphzgeraljq
nmosmkcwtdbziyxuphzgercljq
nvosmkcwtdbfiyxupfmgersljq
nvosmkcvtdbpyyxuphzgeraljq
nvosmkcwtkbfiyaupxzgeraljq
nvosmkcwtzbiiyxuphzgerazjq
nvoxmkcwtdbfiyxuphztegaljq
nvonmkcwtdafiyxuphzgerkljq
rvommkcwtdbfiyxzphzgeraljq
nvosmkcwthbfiysuphzgeraxjq
nvosmkcwtdbfnyxuphzgerccjq
nrosmzcwtdbfiyxuphkgeraljq
nvolmkcdtdbfiyxuphtgeraljq
nvosfkcwtdbfiyeuphcgeraljq
nvowmkcwtdbfhyxuphzgerafjq
gvosmkcwtdbfiyxupbpgeraljq
nvosmkcwtdbkiyxuphegebaljq
nvommufwtdbfiyxuphzgeraljq
uvksmkcwtdbfiysuphzgeraljq
nvosmkcwevbfiyxuphtgeraljq
nvosmkcmtdbfiycuphzgeraxjq
nvcsxkcwtdbfiyxuphzgeraljn
nvosmkcwtdbtiymuphzgeraltq
nvosmfcwtdlfjyxuphzgeraljq
svosmkcitdbfiyxuphzgsraljq
EOT;

preg_match_all('/[^\n]+/', $input, $input_strings_array);

$number_of_duplicates = [];
$two = 0;
$three = 0;

foreach($input_strings_array[0] as $input_string) {
  $previous_letters = [];
  $has_two = false;
  $has_three = false;

  foreach (str_split($input_string) as $letter) {
    if (isset($previous_letters[$letter])) {
      $previous_letters[$letter]++;
    } else {
      $previous_letters[$letter] = 1;
    }
  }

  foreach ($previous_letters as $appearances) {
    if ($appearances === 2 && !$has_two) {
      $two++;

      $has_two = true;
    }
    
    if ($appearances === 3 && !$has_three) {
      $three ++;

      $has_three = true;
    }

    if ($has_two && $has_three) {
      break;
    }
  }
}

echo $two * $three;