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Indexed Sequential Access Method (ISAM) is a combination of contiguous and linked list implementation.

Indexed Sequential Access Method (ISAM) is a combination of contiguous and
linked list implementation. Initially, the key is hashed to produce an index into
an array For example, the array may have 26 entries, each representing the letters
of the alphabet. The hash function will take the first letter of the key and find
it’s position 1-26 in the array. In the array is a pointer to a linked list of nodes
each of which starts with the corresponding letter. Write algorithms to insert an
entry into the list and to find an entry in the list.

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