text: """
  Crystal features that are imported by default in the interpreter namespace
  """
  from __future__ import absolute_import
  
  from sage.misc.lazy_import import lazy_import
  
  lazy_import('sage.combinat.crystals', 'catalog', 'crystals')
  
  lazy_import('sage.combinat.crystals.letters',
              'CrystalOfLetters',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.Letters instead"))
  
  lazy_import('sage.combinat.crystals.fast_crystals',
              'FastCrystal',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.FastRankTwo instead"))
  
  lazy_import('sage.combinat.crystals.highest_weight_crystals',
              'HighestWeightCrystal',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.HighestWeight instead"))
  
  lazy_import('sage.combinat.crystals.kyoto_path_model',
              'KyotoPathModel',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.KyotoPathModel instead"))
  
  lazy_import('sage.combinat.crystals.direct_sum',
              'DirectSumOfCrystals',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.DirectSum instead"))
  
  lazy_import('sage.combinat.crystals.tensor_product',
              ['CrystalOfTableaux', 'TensorProductOfCrystals'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.spins',
              ['CrystalOfSpins', 'CrystalOfSpinsPlus', 'CrystalOfSpinsMinus'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.affine',
              ['AffineCrystalFromClassical', 'AffineCrystalFromClassicalAndPromotion'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.elementary_crystals',
              ['TCrystal', 'RCrystal', 'ElementaryCrystal', 'ComponentCrystal'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.elementary.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.kirillov_reshetikhin',
              'KirillovReshetikhinCrystal',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.KirillovResetikhin instead"))
  
  lazy_import('sage.combinat.crystals.littelmann_path',
              ['CrystalOfLSPaths', 'CrystalOfProjectedLevelZeroLSPaths'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.generalized_young_walls',
              ['InfinityCrystalOfGeneralizedYoungWalls', 'CrystalOfGeneralizedYoungWalls'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.monomial_crystals',
              ['InfinityCrystalOfNakajimaMonomials', 'CrystalOfNakajimaMonomials'],
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.<tab> instead"))
  
  lazy_import('sage.combinat.crystals.infinity_crystals',
              'InfinityCrystalOfTableaux',
              deprecation=(15882, "this is being removed from the global namespace. Use crystals.infinity.Tableaux instead"))
  
  