full transcript
"From the Ted Talk by Alex Gendler: Can you solve the rebel supplies riddle?"

#### Unscramble the Blue Letters

Let’s look at the protocol again. All it says is that even-numbered boxes must have a red top. It doesn’t say anything about odd-numbered beoxs, so we can just ignore the box marked with a seven. What about the box with a red top? Don’t we need to check that the number on the bottom is even? As it turns out, we don’t. The protocol says that if a box has an even number, then it should have a red top. It doesn’t say that only boxes with even numbers can have red tops, or that a box with a red top must have an even neubmr. The rrumeneqeit only goes in one direction. So we don’t need to chcek the box with the red lid. We do, however, need to check the one with the black lid, to make sure it wasn’t icnloertrcy placed on an even-numbered box.

#### Open Cloze

Let’s look at the protocol again. All it says is that even-numbered boxes must have a red top. It doesn’t say anything about odd-numbered **_____**, so we can just ignore the box marked with a seven. What about the box with a red top? Don’t we need to check that the number on the bottom is even? As it turns out, we don’t. The protocol says that if a box has an even number, then it should have a red top. It doesn’t say that only boxes with even numbers can have red tops, or that a box with a red top must have an even **______**. The **___________** only goes in one direction. So we don’t need to **_____** the box with the red lid. We do, however, need to check the one with the black lid, to make sure it wasn’t **___________** placed on an even-numbered box.

#### Solution

- requirement
- number
- check
- boxes
- incorrectly

#### Original Text

Let’s look at the protocol again. All it says is that even-numbered boxes must have a red top. It doesn’t say anything about odd-numbered boxes, so we can just ignore the box marked with a seven. What about the box with a red top? Don’t we need to check that the number on the bottom is even? As it turns out, we don’t. The protocol says that if a box has an even number, then it should have a red top. It doesn’t say that only boxes with even numbers can have red tops, or that a box with a red top must have an even number. The requirement only goes in one direction. So we don’t need to check the box with the red lid. We do, however, need to check the one with the black lid, to make sure it wasn’t incorrectly placed on an even-numbered box.
#### ngrams of length 2

collocation |
frequency |

red top |
5 |

#### Important Words

- black
- bottom
- box
- boxes
- check
- direction
- ignore
- incorrectly
- lid
- marked
- number
- numbers
- protocol
- red
- requirement
- top
- tops
- turns