Question

There is a bunch of keys having key numbers
stamped on each key. There may be few duplicate
keys in the bunch, i.e., more than one key with the
same number. Key numbers are associated with
their locks. A lock can be opened with a key which
must have the lock's key number, as every lock is
designed to be opened with a unique key number.
There is a rare chance of blank keys which are keys
without numbers, and no lock can be opened with
those keys. Lock does not exists for blank keys.​

Answer 1

Answer:

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