| basic(adjective, characteristic, clear, light, start) |
| fundamental(adjective, characteristic, simple, plain, pure) |
| primary(adjective, simple, plain, pure, important) |
| essential(adjective, characteristic, simple, plain, pure) |
| simple(adjective, clear, light, smooth, simple) |
| elemental(adjective, simple, plain, pure, important) |
| rudimentary(adjective, start, simple, plain, important) |
| uncomplicated(adjective, clear, light, smooth, simple) |
| underlying(adjective, simple, top, important, basic) |
| plain(adjective, clear, light, smooth, simple) |
| basal(adjective, start, simple, plain, pure) |
| first(adjective, order, important, opening, original) |
| introductory(adjective, simple, plain, head, beginning) |
| clear(adjective, light, smooth, simple, easy) |
| prime(adjective, pure, important, head, significant) |
| initial(adjective, simple, plain, head, beginning) |
| principal(adjective, important, significant, original, essential) |
| straightforward(adjective, clear, light, smooth, simple) |
| original(adjective, characteristic, simple, plain, important) |
| easy(adjective, clear, light, simple, difficult) |