i-1.0.0
==========
i-1.1.0
i-1.0.0 => u-1.1.0
==========
i-2.0.0
(i-1.0.0 => u-1.1.0) => u-2.0.0
i-1.1.0 => u-2.0.0
i-1.0.0 => u-2.0.0
=========
i-2.0.1
((i-1.0.0 => u-1.1.0) => u-2.0.0) => u-2.0.1
(i-1.1.0 => u-2.0.0) => u-2.0.1
(i-1.0.0 => u-2.0.0) => u-2.0.1
(i-1.0.0 => u-1.1.0) => u-2.0.1
i-2.0.0 => u-2.0.1
i-1.1.0 => u-2.0.1
i-1.0.0 => u-2.0.1
==========
i-2.0.2
i-2.1.0
i-2.1.1
i-2.1.2
i-2.1.3
i-2.2.0
i-2.2.1
i-2.3.0
i-2.3.2
i-2.3.3
i-2.4.0
