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I am not able to understand what this matter of falling into a Tomb is. Whatever the day and month of consultation the resulting line remains in Tomb 
Does it has any relationship with the tomb of the earth's branches?
Chou is the tomb of metal
Wei is the tomb of wooden
Chen is to tomb of water
Xu is the tomb of fire
Chen is the tomb of earth

Sure.
What the rules are for falling in Tomb in Liu Yao is different in different places.
Currently, I work with the idea that line can fall in the line it changes into. It can fall into day.
And if it falls into the line it changes into, that can be open with clash.
There are many other rules, though, interesting to note were the examples from a profesor posted by Axis some time ago, where the Lines had levels of "mutations" where they had initial movement in the original hexagram, working with that line can fall into Tomb even without anything moving, just from the existence of that Tomb in the original hexagram it seems.
And there are a lot of other ways.
But the Tombs/Storages are always the same, even in QMDJ or other parts of the Five Arts, and they are what you listed(Chou - Metal, Chen - Earth/Water etc.)
In this example You will fall into Chou in the way I work with it.
Yet as there is Si, You and Chou on lines 1 and 3, that may qualify for the rules for combination The-Monk was using earlier. So does a line fall in tomb if we use that view to combination...
There are many interesting quesiton on that, but as the rules are usually at least a little different in most practitioners, will need to arrive in what works for you, in my view. : )