16 lines
293 B
Awk
16 lines
293 B
Awk
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{ wrd = $0
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rwrd = ""
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for (i=length(wrd); i>0; --i)
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rwrd = rwrd substr(wrd,i,1)
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if (rwrd == wrd)
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palindromes += 1
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else if ( seen[rwrd] ) {
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if (++pairs < 7)
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print wrd " " rwrd
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} else
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seen[wrd] = wrd
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}
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END {
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print pairs " pairs, " palindromes " palindromes."
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}
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