Two

When two things are closely associated, they represent one thing which has two aspects. Sometimes the one thing is hard to name.

One thing	heavenly/spirit 2-h	earthy/flesh 2-e
creation	heaven	earth	Ge 1:1
nature of existence	without form/vain	void	Ge 1:2
nature of God	light/holiness/Day	dark/love/Night	Ge 1:3
relationship	evening/separation	morning/reconciliation	Ge 1:5
waters/word	waters above	waters below	Ge 1:6
waters below/	seas/chosen	dry land/desolate	Ge 1:10

Repetition 2-r*

When the same phrase is used twice, it means that it is true in a fleshly and a spiritual aspect.

Le 1:3 ¶ If his offering [be] a burnt sacrifice of the herd, let him offer a male without blemish: he shall offer it of his own voluntary will at the door of the tabernacle of the congregation before the LORD.

'he shall bring near him' is repeated. It is translated that 'he shall voluntarily bring near him'. Not only must he physically bring it, but he must willingly bring it.

'*' used as a reference when something is repeated twice.