Which preposition to use with unequivocal

as Occurrences 3%

It is rare that any great contest begins by a blow so unequivocal as the bombardment of Fort Sumter; and rare in recent days for any set of belligerents to risk the ignominy of privateering.

in Occurrences 3%

To prevent the recurrence of such evils as those, and to establish a kingdom on the solid basis of a monarchy, unequivocal in its essence yet restrained in its prerogative, the constitution we are now examining was established.

Which preposition to use with  unequivocal