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| Easy | Medium | Hard | |
| #1 | N_1p | N_1p | N_1p |
| #2 | N_2p | N_2p | N_2p |
| #3 | n_3p | N_3p | N_3p |
| #4 | N_4p | N_4p | N_4p |
| #5 | N_5p | N_5p | N_4p |
| #6 | N_6p | N_6p | N_6p |
| #7 | N_7p | N_7p | N_6p |
| #8 | N_8p | N_8p | N_8p |
| #9 | N_9p | N_9p | N_9p |
| #10 | N_10p | N_10p | N_10p |
| #11 | N_11p | N_11p | N_11p |
| #12 | N_12p | N_11p | N_12p |
| #13 | N_12p | N_13p | N_13p |
| #14 | N_13p | N_14p | N_14p |
| #15 | N_14p | N_15p | N_15p |
| #16 | N_15p | N_16p | N_16p |
| #17 | N_17p | N_17p | bohyc__N_17p |
| #18 | N_18p | N_18p | bonyc_N_18p |
| #19 | N_19p | N_19p | bonyc_N_19p |
| #20 | N_20p | N_20p | bonyc_N_20p |
