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Three things:

Cotton

Pencil

Diamond

What do they all have in common?

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closed as too broad by f'', Maria Deleva, Aza Aug 21 '16 at 5:33

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I think the answer to the question is

Carbon.

Cotton:

Cotton is a biological substance, and thus carbon based.

Pencil:

The pencil lead is made of graphite, which is carbon.

Diamond:

A diamond is just another form of carbon.

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    $\begingroup$ If this turns out to be the intended answer, it's too broad. Millions of different sorts of things have carbon atoms in their molecules. $\endgroup$ – Rosie F Aug 19 '16 at 20:05
  • $\begingroup$ @RosieF, no matter what the answer and what the three things in a tribond are, they would all be too broad by this definition. After all, perhaps pretty much everything could be related to a lot more than 3 things. The question would have been too broad if it had many possible correct answers, not if many more questions could fit the answer(s). $\endgroup$ – Maria Deleva Aug 19 '16 at 20:11
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    $\begingroup$ @MariaDeleva I think Rosie's point of contention is that two of them are or contain something that is carbon while the third merely contains a compound with molecules that have carbon atoms. $\endgroup$ – Will Aug 19 '16 at 20:13
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What do they all have in common?

Tips.

Cotton:

Cotton tips

(Source)

Pencil:

Pencil tips

(Source)

Diamond:

Diamond tips

(Source)

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    $\begingroup$ Welcome to Puzzling! To be honest, I think this answer is better than the accepted one. $\endgroup$ – Deusovi Aug 20 '16 at 5:41
  • $\begingroup$ I would agree with accepted. $\endgroup$ – Hardik Vaghani Aug 20 '16 at 7:10
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Another possibility in addition to the other two answers

Their hardness (or softness) is desired or otherwise significant

cotton

Many people want cotton to be as soft as possible, even using thread count as a rough measure of softness of cotton sheets

pencil

Artists, drafters, and other people use pencils of varying hardness

diamond

diamond defines 10, the highest hardness, on the Mohs scale

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  • $\begingroup$ Clever way to think about the problem, +1. Almost think this is better than the carbon answer, since cotton just doesn't fit as well as it should $\endgroup$ – Avik Mohan Aug 19 '16 at 21:23
  • $\begingroup$ @AvikMohan, I agree - it is much better answer than the one I was seeking. Still, I am not sure if it would be fair to accept it - as I wasn't as clever to think of it myself. $\endgroup$ – Maria Deleva Aug 19 '16 at 22:24
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They are all things which can be made into

dresses.

Cotton:

enter image description here

Pencil:

enter image description here

and Diamond:

enter image description here

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    $\begingroup$ Well so can meat or just about anything else... $\endgroup$ – Will Aug 19 '16 at 20:21
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    $\begingroup$ Well, that was an unexpected answer... +1 for the original answer. $\endgroup$ – Maria Deleva Aug 19 '16 at 20:22
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They all involve:

Carbon

Cotton

Cellulose fibers (Plant made from carbon)

Pencil

Graphite in the lead (Carbon is soft graphite)

Diamond

Diamonds are compressed carbon


Or

They are all ways to describe clothing
(Do a google search on "Cotton Pencil Diamond" & you'll see what I mean)

Cotton Blend Diamond Print Pencil Skirt

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