| Δ0 | blanching vegetables before freezing itself | blanched green beans, blanched broccoli, blanched carrots before freezing |
| Δ1 | other ways of preparing the same vegetables before freezing | raw-freezing broccoli, flash-freezing peas, freezing carrots without blanching, vacuum-sealing raw vegetables |
| Δ2 | other heat-based vegetable preservation methods | canning vegetables, pickling with hot brine, steaming vegetables for storage, pressure-cooking vegetables for jars |
| Δ3 | general vegetable cooking methods | boiling vegetables, roasting vegetables, sauteing vegetables, stir-frying vegetables |
| Δ4 | other kitchen food-storage practices | refrigerating leftovers, dehydrating fruit, storing grains in jars, cold-storing root vegetables |
| Δ5 | topics essentially unrelated to food preparation | car engine maintenance, stock market investing, learning a foreign language, home electrical wiring |