Question: Please explain this system specification line by line and be specific This is TLA+ ---------------------- MODULE HourClock ---------------------- EXTENDS Naturals (* Xunhua Wang, 03/07/2021 *)

Please explain this system specification line by line and be specific

This is TLA+

---------------------- MODULE HourClock ----------------------
EXTENDS Naturals
(* Xunhua Wang, 03/07/2021 *)
VARIABLE hr
HCini == hr in (1 .. 12)
HCnxt == hr' = IF hr # 12 THEN hr + 1 ELSE 1
HC == HCini / [][HCnxt]_hr
--------------------------------------------------------------
THEOREM HC => []HCini
==============================================================

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