User blog comment:SuperJedi224/Part 2/@comment-68.186.6.2-20150801020641/@comment-68.186.6.2-20150801021048

Arfgol = $$\underset{10^{100}}{ARR(\underbrace{10,10,...,10,10})}$$

Arfgarr = $$\underset{10^{100}}{ARR(\underbrace{arfgol,arfgol,...,arfgol,arfgol})}$$

Arfthoth = $$\underset{10^{100}}{ARR(\underbrace{arfgarr,arfgarr,...,arfgarr,arfgarr})}$$

Repeat with great arfthoth, great great arfthoth, ...