Compounds of 無くては

• 無くては
  (exp) (uk) unless
  without
• 無くてはいけない
  (exp) (1) (uk) cannot do without something
  indispensable
  absolutely necessary
  (2) (after negative base of verb) have to do
  (P)
• 無くてはならない
  (exp) (1) (uk) cannot do without something
  indispensable
  absolutely necessary
  (2) (after negative base of verb) have to do