Issue in starting "Manipulating Data with dplyr" module of the "Getting and Cleaning Data" course about swirl_courses HOT 3 OPEN

The same issue: #394

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This problem with "!" in the beginning of line:

Hint: !is.na(c(3, 5, NA, 10)) will negate the previous command, thus telling us what is NOT NA.

I think the most useful solution:

- Class: cmd_question
  Output: 'Now, put an exclamation point (!) before is.na() to change all of the TRUEs to FALSEs and all of the FALSEs to TRUEs, thus telling us what is NOT NA: !is.na(c(3, 5, NA, 10)).'
  CorrectAnswer: "!is.na(c(3, 5, NA, 10))"
  AnswerTests: omnitest('!is.na(c(3, 5, NA, 10))')
  Hint: Expression !is.na(c(3, 5, NA, 10)) will negate the previous command, thus telling us what is NOT NA.```

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Hello Guys,
Please I need help on my first programming assignment on getting and cleaning data, I have installed my R programming and I started the assignment from sandbox but I get to the git page I don't know how to link it together. please kindly assist me.

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