Counter - CS101 - Udacity Udacity English (auto-generated) English

Counter - CS101 - UdacityYouTube↗ IA↗(long shot)
Education 848 views 11 likes 0 dislikes 02 Jun 2012

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so a word is just something that has

[Evans] A word is just something that has meaning

meaning that speakers of the language will understand we could define words as

that speakers of the language will understand.

just what's in the dictionary and then

We could define words as just what's in the dictionary,

there would be a clear answer for that

and then there would be a clear answer for that.

but certainly there are lots of things that are words that aren't in the

But certainly there are lots of things that are words that aren't in the dictionary.

dictionary and the important thing about words is we have rules for making new

And the important thing about words is we have rules for making new words.

words for example we have a rule that says if we have a word we can make a new

For example, we have a rule that says if we have a word,

word by adding counter in front of the old ward I'm using the same notation

we can make a new word by adding counter in front of the old word. I'm using the same notation that we used back in Unit 1.

that we used back in unit 1 this is the BNF replacement grammar if you need a

This is the BNF replacement grammar.

refresher on this please go back to the video that introduced that in unit 1 but

If you need a refresher on this, please go back to the video that introduced that in Unit 1.

the basic property is that we can

But the basic property is that we can replace what's on the left side

replace what's on the left side with what's on the right side so anytime we

with what's on the right side.

have a word we can replace it with

So any time we have a word, we can replace it with counter-word,

counter word and the meaning of the new word is something that goes against the

and the meaning of the new word is something that goes against the original word.

original word so if we started with the word intelligence and I mean this in the

So if we started with the word intelligence--

sense of spycraft not in terms of smarts

and I mean this in the sense of spycraft, not in terms of smarts--

well then we can use the rule we could

then we can use the rule.

make the word counter intelligence

We could make the word counter-intelligence.

intelligence was a word we added counter in front of it to make

Intelligence was a word. We added counter in front of it to make counter-intelligence.

counterintelligence and that means trying to thwart intelligence from the

That means trying to thwart intelligence from the enemy.

enemy we can use the rule again so now

We can use the rule again.

this is a word and we could replace this word with counter in front of that word

So now this is a word, and we could replace this word with counter in front of that word.

and we get counter counter intelligence

We get counter-counter-intelligence,

and that would be trying to thwart the enemy's counterintelligence that's

and that would be trying to thwart the enemy's counter-intelligence

preventing you from getting intelligence

that's preventing you from getting intelligence.

and we could keep doing that we could

And we could keep doing that.

have counter counter counter intelligence and so forth and these are

We could have counter-counter-counter-intelligence and so forth.

words that once we get up to at least

These are words that once we get up to at least 3 counters

three counters it's not something that's used before but it's still something that has a sensible meeting and we could

it's not something that's used before, but it's still something that has a sensible meaning.

do this further words so we saw that one of the very long words was this hippo paw Thomas monstrous to psycho follow phobia and if you knew that this word

We could do this for other words. We saw that one of the very long words was this hippopotomonstrosesquippedaliophobia. If you knew that this word meant fear of long words,

meant fear of long words and even if

you've never seen the word counter in front of that before so now we can make

and even if you've never seen the word counter in front of that before,

the new word counter hippo pato monstrously paid a lil phobia quite

now we can make the new word counter-hippopotomonstrosesquippedaliophobia.

a mouthful but even though you've never

Quite a mouthful. But even though you've never seen that word before--

seen that word before and I expect most

and I expect most of you have never seen that word before--

of you have never seen that word before well you could guess that this is something that goes against the fear of

you could guess that this is something that goes against the fear of long words.

long words maybe there's some new medication that cures people of this

Maybe there's some new medication that cures people of this phobia.

phobia and you could also figure out well if there was a counter counter hippo and so forth phobia well that

You could also figure out if there was a counter-counter-hippo and so forth phobia,

would be something that counteracts the counter hippo and that might be

that would be something that counteracts the counter-hippo,

something where this new drug doesn't work if you have too much coffee then

and that might be something where this new drug doesn't work if you have too much coffee.

coffee would be a counter counter hippo so forth phobia so the point is because English has this rule that allows us to

Then coffee would be a counter-counter-hippo so forth phobia. So the point is, because English has this rule that allows us to make new words

make new words from old words there's no

from old words, there's no such thing as the longest word.

such thing as the longest word we can always make a longer word starting from any word that we have if you remember

We could always make a longer word starting from any word that we have.

how BNF grammars work then you should be

If you remember how BNF grammars work,

able to answer the next quiz

then you should be able to answer the next quiz.

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