     var underscore    : String { get { return self + "_" } }
 }
 
-public extension NSMutableString {
+@objc public extension NSMutableString {
     var space         : NSMutableString { get { append(" "); return self } }
     var point         : NSMutableString { get { append("."); return self } }
     var dash          : NSMutableString { get { append("-"); return self } }

    var _0 : String { get { return self + "0" } }
}

public extension NSMutableString {
    var _1 : NSMutableString { get { append("1"); return self } }
    var _2 : NSMutableString { get { append("2"); return self } }
    var _3 : NSMutableString { get { append("3"); return self } }

    var dot         : String { get { return point } }
}

@objc public extension NSMutableString {
    var dot         : NSMutableString { get { return point } }
}
