Added pick and select for lists

Pick: (1 2 3 4)?4 or (1 2 3 4)?(3 2)
Select: (1 2 3 4)~2 or (1 2 3 4)~(2 3)

ziffers/spec/ziffers.lark

@@ -56,8 +56,9 @@
     right_op: list | number
     // Operators that work only on lists: | << >>
     list_operator: /(\||<<|>>|<>|#|@)(?=[(\d])/
+    // /(\||<<|>>|<>|#|@)(?=[(\d])/
     // Common operators that works with numbers 3+5 3-5 etc.
-    operator: /([\+\-\*\/%\&])/
+    operator: /(\+|-|\*|\/|%|&|\?|~)/
 
     // Euclidean cycles
     // TODO: Support randomization etc.
@@ -66,7 +67,8 @@
     ?euclid_operator: /<[0-9]+,[0-9]+(,[0-9])?>/
     
     // Lisp like list operation
-    lisp_operation:  "(" operator WS sequence ")"
+    lisp_operator: /([\+\-\*\/%\&])/ 
+    lisp_operation:  "(" lisp_operator WS sequence ")"
 
     // Subdivision
     subdivision: "[" subitems "]"