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"Rules or effects may cause an indestructible permanent to be sacrificed, put
into a graveyard, or exiled."

The ending sentence of 700.4 clarifies that Indestructible permanents can still change zones, or even end up in the graveyard through some other means. However, beyond the graveyard, it only mentions exile and not any of the other zones. If we're going to bother adding the clarification, why not make a point for all zones? Example:

"Rules or effects may cause an indestructible permanent to be sacrificed, put into a graveyard, exiled, returned to its owner's hand, or shuffled into its owner's library."


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701.12c:

701.12. Regenerate

701.12a If the effect of a resolving spell or ability regenerates a permanent, it creates a replacement
effect that protects the permanent the next time it would be destroyed this turn. In this case,
“Regenerate [permanent]” means “The next time [permanent] would be destroyed this turn,
instead remove all damage marked on it and tap it. If it’s an attacking or blocking creature,
remove it from combat.”

701.12b If the effect of a static ability regenerates a permanent, it replaces destruction with an
alternate effect each time that permanent would be destroyed. In this case, “Regenerate
[permanent]” means “Instead remove all damage marked on [permanent] and tap it. If it’s an
attacking or blocking creature, remove it from combat.”

701.12c Neither activating an ability that creates a regeneration shield nor casting a spell that
creates a regeneration shield is the same as regenerating a permanent. Effects that say that a
permanent can’t be regenerated don’t prevent such abilities from being activated or such spells
from being cast; rather, they prevent regeneration shields from having any effect.

Rule 701.12c suddenly refers to "the effect of a resolving spell or ability [that] regenerates a permanent" as a "regeneration shield" without any precedence. While this may be simply understood within the context of the English word "shield", this coinage should either be defined as slang in 701.12a or 701.12b (e.g. "...often referred to as a "regeration shield" that "protects" the permanent"), or the word "shield" should be in quotes, clarifying that it does not have actual rules meaning.