Mix the three types of flour in a baking bowl with the seeds and kernels. Melt the yeast in the water and pour it into the bowl with the salt and oil. Mix everything with a spoon at the beginning and then knead it with your hands or in a food processor until it becomes a smooth dough. The dough may still be wet, because whole wheat flour still absorbs a lot of water as it rises. Cover the baking bowl with a clean dishcloth and let the dough rise at room temperature for about 90 minutes, until it has doubled in volume.
Knead the dough for the multigrain bread well on a floured surface. Make one loaf or 18 rolls, as desired.
For the loaf, form the dough into a roll about 30 centimeters long and place it in a greased wide loaf pan. Score the surface of the dough diagonally a few times with a sharp kitchen knife, brush with water and sprinkle with any seeds and kernels.
Cover with a clean dish and let the dough rise in a warm place until its volume increases significantly, which takes about 45 min. Bake the bread in the form at 200 °C in a heated oven for 45 to 50 min.