to my best knowledge the number of datatypes is equal to the length of the dt_descr; so we can save one argument in define_raw_perm
quick_and_dirty := true;
no_document use_thys
["Ex/Lambda",
"Ex/ExLF",
"Ex/SingleLet",
"Ex/Ex1rec",
"Ex/Ex2",
"Ex/Ex3",
"Ex/ExLet",
"Ex/ExLetRec",
"Ex/TypeSchemes",
"Ex/ExLeroy",
"Ex/ExPS3",
"Ex/ExPS7",
"Ex/ExCoreHaskell",
"Ex/Test"
(* "Ex/ExPS6", *)
];