comma
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A pair of parentheses is used to "enclose" numbers or letters in a series or elsewhere when enclosure is useful to understand the meaning. However, to separate the items in a series, only a comma and space after each item is needed, along with a conjunction to close the series. Examples: 1, 1, 2, and 3 are the first four numbers of a Fibonacci series; paragraphs (A), (B)(2), and (D) are the most relevant ones for this discussion.
A map reference indicating a location in terms of a series of vertical and horizontal grid lines identified by numbers or letters.
A palindrome is any series of letters, numbers or other symbols that are the same whether read forward or backward, such as the word level.
E. They are the initial letters of the numbers 0-7 in words: Zero, One, Two, Seven The next is 8 - Eight
Palindromes do not have a physical shape - they are series of characters (numbers, letters, etc) that can be read the same way backward and forward, such as '12321' or 'level' or 'race fast safe car'.