Place 1/2 cup (125 ml) of warm water into a large bowl and add the yeast and sugar, stirring gently to mix the ingredients evenly. Allow the mixture to sit for 5 to 10 minutes, or until foam starts developing on the surface. If the yeast mixture does not become foamy, that means the yeast is dead or will otherwise not activate. As a result, the bread will not rise if you continue forward from here. If this happens, you should buy a new packet of yeast and start over. Pour the remaining water into the yeast mixture, along with the oil, salt, and 2 cups (500 ml) of the all-purpose flour. Stir the contents of the bowl together using a wooden mixing spoon until evenly combined.  If you have an electric stand mixer with a dough hook attachment, you could mix the dough ingredients together using that instead. The electric mixer can also help you knead the dough in future steps. Do not add all the flour at once, since doing so would make the dough harder to form. Add it in gradually, bit by bit. Add the masa harina (corn flour) and white cornmeal into the bowl and stir well to incorporate it. If you are unable to find masa harina, you will need to substitute it for another type of corn flour. Extra cornmeal can be used in a pinch, but do so only as a last resort, since cornmeal is coarser and will affect the texture of the bread. Regular wheat flour would be a better substitute. Do not use corn starch as a substitute under any circumstances, however. Gradually add the remaining 3 cups (750 ml) of all-purpose flour into the bowl. Add roughly 1 cup (250 ml) at a time and stir well after each addition. Continue until all the flour has been mixed in.  Note that, as the dough gets thicker and tougher, you might find it more difficult to stir it using your wooden mixing spoon. Should this happen, lightly dust your hands with flour and begin mixing the dough using your hands. You can also put flour on the sides of the bowl to prevent it from sticking. If you have been mixing the dough with a stand mixer and dough hook, you...

TL;DR in Indonesian:
Aktifkan ragi. Masukkan sebagian besar bahan adonan. Masukkan tepung jagung ke dalam adonan. Masukkan sisa tepung terigu. Uleni adonan. Biarkan adonan mengembang hingga dua kali lipatnya.