## Question 1
Consider the following accounts:

```Text
Accounts = [ [Kate, k3@mail.com, k56@mail.com, kt@mail.com],

             [Kim, k65@mail.com, km@mail.com],

             [Kim, k@mail.com, k3@mail.com, k5@mail.com],

             [Kate, k78@mail.com, k90@mail.com, kt@mail.com] ]
```
What is the number of accounts in the output?
### Options

1. 4
Incorrect

----------------------------

2. 3
Correct
The first and the fourth accounts were merged since they shared the email kt@mail<span>.</span>com. However, the second and third accounts don’t share any emails. Therefore, the total number of accounts in the output becomes three. 
----------------------------

3. 2
Incorrect

----------------------------

4. 1
Incorrect

----------------------------

---------------------------------------------

## Question 2
Consider the following accounts:

```Text
Accounts = [ [Anna, anna_art@mail.com, anna_work@mail.com, anna_home@mail.com],

             [Anna, anna@mail.com, anna_art@mail.com, anna_work@mail.com],

             [Charles, charlie@mail.com, charl@mail.com],

             [Emily, emily@mail.com, emily_first@mail.com, emily123@mail.com] ]
```

What is the correct output?
### Options

1. ```Text
[ [Anna, anna_home@mail.com, anna_art@mail.com, anna_work@mail.com],

  [Anna, anna@mail.com, anna_art@mail.com, anna_work@mail.com],

  [Charles, charlie@mail.com, charl@mail.com],

  [Emily, emily@mail.com, emily_first@mail.com, emily123@mail.com] ]
```
Incorrect

----------------------------

2. ```Text
[ [Anna, anna_home@mail.com, anna_art@mail.com, anna_work@mail.com, Anna, anna@mai.com, anna_art@mail.com, anna_work@mail.com],

  [Charles, charlie@mail.com, charl@mail.com],

  [Emily, emily@mail.com, emily_first@mail.com, emily123@mail.com] ]
```
Incorrect

----------------------------

3. ```Text
[ [Anna, anna@mail.com, anna_art@mail.com, anna_home@mail.com, anna_work@mail.com],

  [Charles, charl@mail.com], charlie@mail.com],

  [Emily, emily123@mail.com, emily@mail.com, emily_first@mail.com] ]
```
Correct
The first and the second account share the emails anna_art@mail<span>.</span>com and anna_work@mail<span>.</span>com, so they got merged.
----------------------------

4. ```Text
[ [Anna, anna@mail.com, anna_art@mail.com, anna_home@mail.com, anna_work@mail.com],

  [Charles, charlie@mail.com, charl@mail.com],

  [Emily, emily@mail.com, emily_first@mail.com, emily123@mail.com] ]
```
Incorrect
The emails in each account have not been sorted.
----------------------------

---------------------------------------------

## Question 3
Consider the following accounts:

```Text
Accounts = [ [Sarah, s1@mail.com, s12@mail.com, s123@mail.com],

             [Sarah, s54@mail.com, s45@mail.com],

             [Sarah, s@mail.com, sh@mail.com, s7@mail.com] ]
```

What is the number of accounts in the output?
### Options

1. 1
Incorrect

----------------------------

2. 2
Incorrect

----------------------------

3. 3
Correct
None of the accounts share any email addresses, so the final output will have three accounts.
----------------------------

4. 4
Incorrect

----------------------------

---------------------------------------------