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If NAME =~ /BAA/
   if ITEMS_A =~ /^134/
...
       # Either ITEMS_B starts wit 134 or 00 or something
       # else. The last case is targeted by your second
       # ITEMS_B-if

SWITCH: for ($ITEMS_B) {
  /^134/ && do {
...
    last SWITCH;
  }
}