Replace each space in "1 2 3 4" with "---".

42.1

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Get a sorted list of all sequences of 4 digits (representing possible dates) in the Wikipedia article on computers.

42.2

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Extract “headings” in the Wikipedia article about computers, as indicated by strings starting and ending with "===".

42.3

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Use a string template to make a grid of results of the form i+j=... for i and j up to 9.

42.4

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Find names of integers below 50 that have an “i” somewhere before an “e”.

42.5

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Make any 2-letter word uppercase in the first sentence from the Wikipedia article on computers.

42.6

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Make a labeled bar chart of the number of countries whose TextString names start with each possible letter.

42.7

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Find simpler code for 
Grid[Table[StringJoin[TextString[i],"^",TextString[j],"=",TextString[i^j]],{i,5},{j,5}]].

42.8

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