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for(var i in properties){(function(which){
var p = i;
which["get"+p]=function(){
return properties[p];
};
which["set"+p]=function(val){
properties[p]=val;
};
})(this);
}
}
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//....
})(b)
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seta:function(val){this.a=val;},
getb:function(){return this.b;},
setb:function(val){this.b=val;}
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