% Propositional version of the Salt and Mustard puzzle from Lewis Carroll

set(auto).

list(usable).
sl | -mb | -sb | -sm | -ml | sc | mc | sd | md | mm.
-sm | mb | ml.
-sm | mb | sl.
-sm | sb | ml.
-sm | sb | sl.
-ml | -mc | -mm.
-ml | -mc | -sm.
-ml | -sc | -mm.
-ml | -sc | -sm.
-md | -ml | -mm.
-md | -ml | -sm.
-md | -sl | -mm.
-md | -sl | -sm.
-sd | -mb | mc.
-sd | -mb | sc.
-sd | -sb | mc.
-sd | -sb | sc.
-mc | md | ml.
-mc | md | sl.
-mc | sd | ml.
-mc | sd | sl.
-mb | -md | mm.
-mb | -md | sm.
-mb | -sd | mm.
-mb | -sd | sm.
sd | -md | mm.
-sd | md | mm.
sc | -mc | mm.
-sc | mc | mm.
-sl | -ml | sm.
-sb | -mb | sm.
sd | -md | sl.
-sd | md | sl.
sb | -mb | sl.
-sb | mb | sl.
-sc | -mc | sd.
-sl | -ml | mc.
-sd | -md | mc.
sb | -mb | sc.
-sb | mb | sc.
-sm | -mm | mb.
sl | -ml | sb.
-sl | ml | sb.
sc | -mc | sb.
-sc | mc | sb.
-sc | -mb | -sb | -mm.
-sc | -mb | -sb | -sm.
-sc | sb | mb | -mm.
-sc | sb | mb | -sm.
-mm | -mc | -sc | -md | -sd.
-mm | sc | mc | sd | md.
-sl | -mb | -sb | -md | -sd.
-sl | -mb | -sb | sd | md.
-sl | sb | mb | -md | -sd.
-sb | -mc | -sc | -ml | -sl.
-sb | -mc | -sc | sl | ml.
sm | mm | ml.
sc | mc | ml.
sm | mm | md.
sl | ml | md.
sb | mb | sd.
sm | mm | sc.
sd | md | mb.
end_of_list.