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# get prefix
sub prefix {
...
        }
    }
}

found: prefix(CHAKVETADZE CHAN) = CHA, suffix(GARBIN JOHANSSON COIN CH
+AN TANASUGARN) = N, CHA.N = CHAN
found: prefix(WOZNIAK WOZNIACKI) = WOZNIA, suffix(WOZNIAK CZINK PASZEK
+ SREBOTNIK) = K, WOZNIA.K = WOZNIAK
...
found: prefix(SAFAROVA SAFINA) = SAF, suffix(VESNINA DUSHEVINA SAFINA)
+ = INA, SAF.INA = SAFINA
found: prefix(COIN CORNET) = CO, suffix(GARBIN COIN) = IN, CO.IN = COI
+N
found: prefix(PARMENTIER PETROVA PENG PENNETTA PIRONKOVA PASZEK PEER P
+AVLYUCHENKOVA) = P, suffix(PENG ZHENG) = ENG, P.ENG = PENG

real    0m0.387s
user    0m0.381s
sys     0m0.003s

real    0m12.441s
user    0m12.219s
sys     0m0.015s

real    0m6.405s
user    0m6.273s
sys     0m0.007s