actualize
   list-del

with
   partelem
by morphism
   :elem → partelem; 
   :list → partition; 
   [] → []; 
   .first → .head; 
   .rest → .tail; 
   + → +; 
   # → #; 
   ' → '; 
   + → +; 
   + → +; 
   + → +; 
   ++ → ++; 
   rmdup → rmdup; 
   .last → .last; 
   .butlast → .butlast; 
   butlastn → butlastn; 
   rev → rev; 
   mklist → mklist; 
   fillfirst → fillfirst; 
   -l → -l; 
   -1l → -1l; 
   -1l → -1l; 
   ] → ]; 
   pos → pos; 
   ] → ]; 
   sublist → sublist; 
   firstn → firstn; 
   restn → restn; 
   lastn → lastn; 
   frome → frome; 
   < → <; 
   ∈ → ∈; 
   dups → dups; 
   disj → disj; 
   ⊑ → ⊑; 
   ⊒ → ⊒; 
   a → p; 
   b → p0; 
   c → p1; 
   a0 → p2; 
   x → P; 
   y → P0; 
   z → P1; 
   x0 → P2; 
   y0 → P3; 
   z0 → P4; 
   x1 → P5; 
   y1 → P6; 
   z1 → P7; 
   x2 → P8; 
   y2 → P9; 
   z2 → P10
end actualize