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var a = new Array('Dominik','Jakub','Konrad','Tomasz','Maciek','Mateusz');
var b = new Array('Błażko','Hajduk','Hajduk','Laska','Kowalczyk','Gorgol');

for(var i=0;i<3;i++){
var ra=Math.round(Math.random()*4);
var rb=Math.round(Math.random()*4);
document.write(a[ra]+" "+b[rb]+"<br>");
}