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2.2.11 Sequences
The function Flatten allows you to explicitly flatten out all sublists.
In[1]:= Flatten[{a, {b, c}, {d, e}}]
Out[1]= 
FlattenAt lets you specify at what positions you want sublists flattened.
In[2]:= FlattenAt[{a, {b, c}, {d, e}}, 2]
Out[2]= 
Sequence objects automatically get spliced in, and do not require any explicit flattening.
In[3]:= {a, Sequence[b, c], Sequence[d, e]}
Out[3]= 

Representing sequences of arguments in functions.
Sequence works in any function.
In[4]:= f[Sequence[a, b], c]
Out[4]= 
This includes functions with special input forms.
In[5]:= a == Sequence[b, c]
Out[5]= 
Here is a common way that Sequence is used.
In[6]:= {a, b, f[x, y], g[w], f[z, y]} /. f->Sequence
Out[6]= 
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