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edited Jan 20, 2022 at 20:03

Vyxal, 64 bytes

ka¦?UcU:ż⁼

Takes a list of nonnegative integers.

ka¦U    # prefixes of alphabetUniquify
     c⁼ # contains
Is equal to
 ?U:ż  # Input uniquified1...length?

ka¦?Uc

ka¦    # prefixes of alphabet
     c # contains
   ?U  # Input uniquified

U:ż⁼

Takes a list of nonnegative integers.

U    # Uniquify
   ⁼ # Is equal to
 :ż  # 1...length?

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created Jan 20, 2022 at 19:16

ka¦?Uc

ka¦    # prefixes of alphabet
     c # contains
   ?U  # Input uniquified