De Kooning's best paintings, from the '40s as well as the early '80s, flirt with refinement and turbulence.
No one can argue that De Kooning's best paintings are from the 40's and 50's.
mnli hypothesis: No one can argue that De Kooning's best paintings are from the 40's and 50's. premise: De Kooning's best paintings, from the '40s as well as the early '80s, flirt with refinement and turbulence.