Interoperation between primary and secondary care systems is rather primitive. The primary and secondary lead production processes are similar. Research focused on primary and secondary industries. Public securities markets are either primary or secondary markets. Education in primary and secondary public schools is free and compulsory. Pollutants are classified as primary or secondary. Hyperlipidemias are divided into primary and secondary subtypes. Maryland has a broad range of private primary and secondary schools. Particulates are formed from both primary and secondary pathways. Namibia has free education for both primary and secondary education levels. Cairns has numerous primary and secondary schools. Smog formation in general relies on both primary and secondary pollutants. Follicles can be classed as either primary or secondary follicles. There are two levels of benefits for pesticide use, primary and secondary. Wrexham has a number of primary and secondary schools.