Enter a clue or pattern or both:

The Clue

Intro material (6 letter answer)

The Answer

PROLOG

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Notes

The answer PROLOG is so rare that it appears less than once every 2500 puzzles.

Related Clues

Intro
Preface

Definition

PROLOG as a noun:

1. (Prolog, logic programing, logic programming) = a computer language designed in Europe to support natural language processing