How to split a list using XSLT?

Question

XSL & XSLT

There is an XML with a complex structure, one of the elements of which is a list, the size of which is not known in advance.
Is it possible to split this list into several parts while keeping the rest of the structure intact? Well, almost untouched.
Example:

<L4>
  <AAA>a</AAA>
  <BBB>b</BBB>
  <CCC>
    <DDD>a:b:C:123.400.01</DDD>
    <DDD>a:b:C:123.400.02</DDD>
    <DDD>a:b:C:123.400.03</DDD>
    <DDD>a:b:D:123.401.01</DDD>
    <DDD>a:b:D:123.401.02</DDD>
    <DDD>a:b:E:123.402.01</DDD>
  </CCC>
  <DDD>d</DDD>
  ...
  <ZZZ>z</ZZZ>
</L4>

Differences - different beginning of the values ​​of the list elements - a:b:C, a:b:D and a:b:E
As a result, we get such a list of elements

<L4>
  <AAA>a</AAA>
  <BBB>b</BBB>
  <CCC>
    <DDD>a:b:C:123.400.01</DDD>
    <DDD>a:b:C:123.400.02</DDD>
    <DDD>a:b:C:123.400.03</DDD>
  </CCC>
  <DDD>d</DDD>
  ...
  <ZZZ>z</ZZZ>
</L4>
<L4>
  <AAA>a</AAA>
  <BBB>b</BBB>
  <CCC>
    <DDD>a:b:D:123.401.01</DDD>
    <DDD>a:b:D:123.401.02</DDD>
  </CCC>
  <DDD>d</DDD>
  ...
  <ZZZ>z</ZZZ>
</L4>
<L4>
  <AAA>a</AAA>
  <BBB>b</BBB>
  <CCC>
    <DDD>a:b:E:123.402.01</DDD>
  </CCC>
  <DDD>d</DDD>
  ...
  <ZZZ>z</ZZZ>
</L4>

Those. the element will be repeated according to the number of different a:b:X: elements (there can be 1-3 of them).