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use warnings;
use strict; 
...
        }
    }
}

use warnings;
use strict;
...
}

dd "after", \@array1_split_2D, \@array2_split_2D;

(
  "before",
...
    ["ux", "side", "clkack"],
  ],
)

#!/usr/bin/env perl
use warnings;
...
ux_xtal_frm_refclk / ccu_ux_xtal_frm_refclk_ack -> ux_xtal_frm_refclk
ux_xtal_frm_refclk / ibbs_ux_prim_clkack        -> ux_
ux_xtal_frm_refclk / sbr_ux_side_clkack         -> ux_