show following contacts:
select all   select none
base-phosphate
  H_0BPh/AA
  H_7BPh/CC
base-ribose
  W_5BR/UG
bp
  HW_cis/AA
special
  HH_tran/GG
  HS_cis/GA
  HS_tran/GA
  SH_cis/AG
  SH_tran/AG

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