code: def fuse_slice(a, b):
      """Fuse stacked slices together
  
      Fuse a pair of repeated slices into a single slice:
  
      >>> fuse_slice(slice(1000, 2000), slice(10, 15))
      slice(1010, 1015, None)
  
      This also works for tuples of slices
  
      >>> fuse_slice((slice(100, 200), slice(100, 200, 10)),
      ...            (slice(10, 15), [5, 2]))
      (slice(110, 115, None), [150, 120])
  
      And a variety of other interesting cases
  
      >>> fuse_slice(slice(1000, 2000), 10)  # integers
      1010
  
      >>> fuse_slice(slice(1000, 2000, 5), slice(10, 20, 2))
      slice(1050, 1100, 10)
  
      >>> fuse_slice(slice(1000, 2000, 5), [1, 2, 3])  # lists
      [1005, 1010, 1015]
  
      >>> fuse_slice(None, slice(None, None))  # doctest: +SKIP
      None
      """
      # None only works if the second side is a full slice
      if a is None and isinstance(b, slice) and b == slice(None, None):
          return None
  
      # Replace None with 0 and one in start and step
      if isinstance(a, slice):
          a = normalize_slice(a)
      if isinstance(b, slice):
          b = normalize_slice(b)
  
      if isinstance(a, slice) and isinstance(b, Integral):
          if b < 0:
              raise NotImplementedError()
          return a.start + b * a.step
  
      if isinstance(a, slice) and isinstance(b, slice):
          start = a.start + a.step * b.start
          if b.stop is not None:
              stop = a.start + a.step * b.stop
          else:
              stop = None
          if a.stop is not None:
              if stop is not None:
                  stop = min(a.stop, stop)
              else:
                  stop = a.stop
          step = a.step * b.step
          if step == 1:
              step = None
          return slice(start, stop, step)
  
      if isinstance(b, list):
          return [fuse_slice(a, bb) for bb in b]
      if isinstance(a, list) and isinstance(b, (Integral, slice)):
          return a[b]
  
      if isinstance(a, tuple) and not isinstance(b, tuple):
          b = (b,)
  
      # If given two tuples walk through both, being mindful of uneven sizes
      # and newaxes
      if isinstance(a, tuple) and isinstance(b, tuple):
          # Check for non-fusible cases with fancy-indexing
          a_has_lists = any(isinstance(item, list) for item in a)
          b_has_lists = any(isinstance(item, list) for item in b)
          if a_has_lists and b_has_lists:
              raise NotImplementedError(
                  "Can't handle multiple list indexing"
              )
          elif a_has_lists:
              check_for_nonfusible_fancy_indexing(a, b)
          elif b_has_lists:
              check_for_nonfusible_fancy_indexing(b, a)
  
          j = 0
          result = list()
          for i in range(len(a)):
              #  axis ceased to exist  or we're out of b
              if isinstance(a[i], Integral) or j == len(b):
                  result.append(a[i])
                  continue
              while b[j] is None:  # insert any Nones on the rhs
                  result.append(None)
                  j += 1
              result.append(fuse_slice(a[i], b[j]))  # Common case
              j += 1
          while j < len(b):  # anything leftover on the right?
              result.append(b[j])
              j += 1
          return tuple(result)
      raise NotImplementedError()
  
imports: from __future__ import annotations
  from collections.abc import Callable
  from itertools import zip_longest
  from numbers import Integral
  from typing import Any
  import numpy
  from dask import config
  from dask.array.chunk import getitem
  from dask.array.core import getter, getter_inline, getter_nofancy
  from dask.blockwise import fuse_roots, optimize_blockwise
  from dask.core import flatten, reverse_dict
  from dask.highlevelgraph import HighLevelGraph
  from dask.optimization import SubgraphCallable, fuse, inline_functions
  from dask.utils import ensure_dict
label_desc: Use image node_id 7 for calling a global function with example usage: fuse_slice(a, b) and returns: None, unknown, slice, unknown, a, tuple