I found other pairs all have symmetry, even though, unlike the master one, their symmetry is split.

Symmetry, pairs.

Two pairs.

Fruit flies have 4 pairs, and bananas have 11 pairs.

Split

Split

Split

Split

Change Split Orientation when main window is split.

Chickens have 39 pairs.

That makes three pairs.

Me too... 3 pairs.

Let's split.

Let's split.

Let's split.

split pane

Split Track

Split View

Split Channels

Split View

Split Vertical

Split Horizontal

Split Horizontal

Split Direction

Split Vertical

Split Vertical

Split Horizontal

Split horizontal

Split View

Split Horizontal

Split vertical

Split horizontal

Split Segment

UNPAs Split

Split up?

There's no breeding pairs left.

We created you in pairs ,

And created you in pairs ?

and create you in pairs ?

And created you in pairs ?

and create you in pairs ?

We created you in pairs ,

There's no breeding pairs left.

So he pairs these up.

Now there are 10 pairs.