Idioms involving 'two'

[Haihao]

Hi,

Could you tell me what the sense of 'two' is in the following idioms:

1. Put two and two together.
2. Put the two together.

Thank you.

haihao

[Tamara]

2 + 2

For example, to understand something (situation) clearly by interpreting separate facts together.

A bit another use: 'As plain as two plus two make four.'
(Also see: http://en.wikipedia.org/wiki/Two_plus_two_make_five )
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