Some definitions of interest.
hnum	Def hnum ==
	Thm* hnum  S
hrep_num	Def rep_num == n:. ncompose(suc_rep;n;zero_rep)
	Thm* rep_num  (hnum  hind)
label	Def t  ...$L == t
nat	Def  == {i:| 0i }
	Thm*   Type
	Thm*   S

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