@charges = (
  [qw/ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8/],
  [qw/ch1 ch2 ch3 ch4 ch5/],
  [qw/ch1 ch2 ch6 ch7/],
  [qw/ch4/],
  [qw/ch3 ch9/],
  [qw/ch2 ch4/],
)