@examples
format sparse
1 1:0.232667 2:2.352690 3:0.360826 4:10.122427 5:0.701177 6:33.031031 7:0.596583 8:12.339454 9:0.782328 10:22.370767 11:0.859905 12:60.150388 13:0.863234 14:53.216799 15:0.859716 16:44.473540 17:0.855265 18:64.757157 
1 1:0.483826 2:11.187548 3:0.602168 4:23.225276 5:0.707503 6:18.167569 7:0.706341 8:15.646422 9:0.796148 10:25.010373 11:0.860468 12:73.761710 13:0.859126 14:39.207939 15:0.860100 16:51.134653 17:0.857838 18:64.007020 
1 1:0.608095 2:23.817507 3:0.610736 4:19.468765 5:0.658554 6:26.153825 7:0.638427 8:13.978497 9:0.786674 10:25.103943 11:0.859912 12:73.308193 13:0.852943 14:41.152830 15:0.857871 16:49.549469 17:0.853477 18:61.203460 
1 1:0.619245 2:12.431140 3:0.667855 4:11.820120 5:0.716132 6:19.627178 7:0.821426 8:20.073032 9:0.839589 10:33.239191 11:0.858891 12:70.185045 13:0.836974 14:51.286478 15:0.843755 16:62.183011 17:0.838704 18:55.001844 
1 1:0.618685 2:11.777467 3:0.650148 4:11.260272 5:0.706168 6:20.801070 7:0.820082 8:20.925394 9:0.841398 10:37.440252 11:0.859132 12:71.311702 13:0.853018 14:56.199097 15:0.857642 16:62.016993 17:0.844954 18:49.383645 
1 1:0.667026 2:20.143794 3:0.653915 4:16.814844 5:0.667775 6:24.743978 7:0.749194 8:15.360144 9:0.842678 10:45.529778 11:0.856839 12:62.808374 13:0.836732 14:65.472474 15:0.838468 16:61.447972 17:0.835705 18:55.719639 
1 1:0.703910 2:16.362696 3:0.700648 4:14.458304 5:0.701997 6:20.102376 7:0.794335 8:24.052588 9:0.855991 10:59.493418 11:0.853715 12:54.105070 13:0.847831 14:62.984963 15:0.858080 16:61.389443 17:0.856417 18:63.500912 
1 1:0.721859 2:26.101686 3:0.677173 4:18.980828 5:0.685423 6:23.329265 7:0.800019 8:18.188459 9:0.842303 10:46.909170 11:0.849628 12:44.091517 13:0.852795 14:60.505627 15:0.858875 16:63.366701 17:0.847782 18:53.091423 
1 1:0.677889 2:25.049039 3:0.660270 4:24.074600 5:0.683949 6:23.345480 7:0.802280 8:17.595161 9:0.843192 10:50.549938 11:0.843415 12:35.455181 13:0.851362 14:56.944399 15:0.854724 16:69.641727 17:0.838727 18:35.536530 
0 1:0.700938 2:24.426663 3:0.688101 4:21.356074 5:0.713615 6:22.752715 7:0.831792 8:22.467440 9:0.856767 10:62.661412 11:0.842952 12:33.160549 13:0.848092 14:55.757101 15:0.855344 16:67.399555 17:0.844810 18:42.707240 
0 1:0.674545 2:18.634735 3:0.686737 4:19.282136 5:0.706683 6:22.871942 7:0.824738 8:29.721074 9:0.856223 10:59.214189 11:0.839325 12:30.859760 13:0.854665 14:60.411188 15:0.859663 16:73.209360 17:0.848968 18:42.779198 
0 1:0.679944 2:25.787609 3:0.654966 4:21.068732 5:0.687245 6:24.668821 7:0.839047 8:36.619591 9:0.844548 10:48.390232 11:0.842113 12:34.133902 13:0.835577 14:55.877847 15:0.843955 16:66.397527 17:0.829856 18:36.441086 
0 1:0.667165 2:26.712409 3:0.669785 4:21.037508 5:0.703695 6:24.467048 7:0.851785 8:45.943261 9:0.854210 10:44.981799 11:0.838140 12:33.854060 13:0.844764 14:48.444741 15:0.860276 16:65.384424 17:0.846336 18:41.866739 
0 1:0.661317 2:24.086883 3:0.699604 4:24.200179 5:0.699755 6:23.271016 7:0.844544 8:29.623185 9:0.843102 10:37.438204 11:0.819329 12:33.103405 13:0.830456 14:43.934260 15:0.838276 16:42.951362 17:0.825924 18:36.907047 
0 1:0.663648 2:22.827455 3:0.702427 4:25.083175 5:0.695371 6:21.898086 7:0.839386 8:29.051409 9:0.839752 10:37.204184 11:0.821268 12:39.166291 13:0.846474 14:39.418364 15:0.848371 16:44.120693 17:0.833332 18:40.266399 
0 1:0.675307 2:22.324834 3:0.700920 4:25.188966 5:0.686228 6:20.663048 7:0.841183 8:31.060278 9:0.838438 10:36.307085 11:0.824208 12:45.353222 13:0.844268 14:34.494761 15:0.844653 16:39.314833 17:0.827300 18:42.664742 
0 1:0.696232 2:20.395173 3:0.721208 4:23.682740 5:0.715049 6:21.470730 7:0.842380 8:30.115933 9:0.836970 10:35.176354 11:0.822591 12:52.617166 13:0.838105 14:31.704039 15:0.844647 16:34.833988 17:0.821632 18:53.653131