PRESOLVED 0 NBLOCKS 5 BLOCK 0 c1 c2 c3 c4 BLOCK 1 c5 c6 c7 c8 BLOCK 2 c9 c10 c11 c12 BLOCK 3 c13 c14 c15 c16 BLOCK 4 c17 c18 c19 c20 MASTERCONSS c21