Clue: Portal represented 20 times in this puzzle that lets you in and out of a confined space (Note: These special letters, reading left to right, row by row, will produce an apt four-word phrase)

Portal represented 20 times in this puzzle that lets you in and out of a confined space (Note: These special letters, reading left to right, row by row, will produce an apt four-word phrase) is a crossword puzzle clue that we have spotted 1 time. There are related clues (shown below).

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