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chomp @input_data;

use strict;
use warnings;
...
0.2009383839,  0.0929288282, 0.2009383839,  0.0929288282,  0.092928828
+2, 0.2009383839,  0.0929288282
0.0939383839,  0.5929288282, 0.0939383839,  0.5929288282,  0.592928828
+2, 0.0939383839,  0.5929288282
0.2939383839, -0.0929288282, 0.2939383839, -0.0929288282, -0.092928828
+2, 0.2939383839, -0.0929288282

          Rate original presplit
original 205/s       --     -59%
presplit 498/s     143%       --