The North Central Public Health District is nearing completion of a comprehensive list of all the entities in its three-county service area that fall within the four groups of Phase 1a of the Oregon vaccine sequencing plan. The health district is offering vaccine clinics to eligible individuals in the four groups.   District officials say there are many hundreds of people in Phase 1a and it will take time to get through them. Thus far, the district has been getting 100 doses of vaccine a week the last several weeks.  Counties may not be in the same phase due to population size and availability of the vaccine.  The District says the Sherman County Medical Clinic in Moro got its own vaccine supply and was able to proceed through Phase 1a quicker.