| leading(adjective, top, head, beginning, original) |
| light(adjective, quiet, clear, smooth, simple) |
| lucid(adjective, quiet, clear, smooth, easy) |
| major(important, significant, original, basic, vital) |
| natal |
| no problem(expression, clear, light, smooth, simple) |
| no sweat(expression, clear, light, smooth, simple) |
| not difficult(expression, clear, light, smooth, simple) |
| opening(adjective, head, beginning, original, basic) |
| picnic(adjective, clear, light, smooth, simple) |
| primeval(adjective, head, beginning, original, prime) |
| primogenial(adjective, head, beginning, fresh, original) |
| pristine(adjective, head, beginning, original, prime) |
| prolegomenous(adjective, preliminary, introductory) |
| pure and simple(expression, adjective, idiom, clean, plain) |
| refined(adjective, simple) |
| seminal |
| severe |
| simple as ABC(expression, idiom, clear, light, smooth) |
| single(adjective, simple, clean, plain, pure) |