code: def sorted_variants(variants):
      """Returns sorted(variants, key=variant_range_tuple)."""
      return sorted(variants, key=variant_range_tuple)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import enum
  import itertools
  import six
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import ranges
  from third_party.nucleus.util import variantcall_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 41 for calling a global function with example usage: sorted_variants(variants) and returns: sorted