tt.awk - plan9port - [fork] Plan 9 from user space
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       tt.awk (189B)
       ---
            1 NF == 2        {
            2                 if($2 !~ / or / || $2 ~ /\(or/)
            3                         print $0
            4                 else {
            5                         n = split($2, a, / or /)
            6                         for(i = 1; i <= n; i++) {
            7                                 printf "%s\t%s\n", $1, a[i]
            8                         }
            9                 }
           10         }
           11 NF != 2 {
           12         print $0
           13         }