TreeNode () { return node("Root", node("RootColor", node("RootColorRed"), node("RootColorGreen"), node("RootColorBlue")), node("RootDigit", node("RootDigitOne"), node("RootDigitTwo"), node("RootDigitThree"), node("RootDigitFour"), node("RootDigitFive"), node("RootDigitSix"), node("RootDigitSeven"), node("RootDigitEight"), node("RootDigitNine")), node("RootGreek", node("RootGreekAlpha"), node("RootGreekBeta"), node("RootGreekGamma"), node("RootGreekDelta"), node("RootGreekEpsilon"))); }