User:Robert Ullmann/L4-5

Analysis of L4 and L5 headers
Notes:
 * There is no official list of L4 headers at present, the WT:ELE examples are a subset of those considered acceptable.
 * POS and L3 headers can occur at L4 when under distinguished etymologies.
 * Some headers show up at level 6, at the beginning of the invalid table, the only valid case here is "Translations to be checked"
 * This is an analysis, it is not a policy document.