Formal employment is more reliable than informal employment. These tend to fall under the categories of formal and informal mentoring relationships. See informal and formal names for more details. The educational system may use a combination of formal, informal, and nonformal learning methods. Fallacies are commonly divided into "formal" and "informal". Verbs express T-V distinction by using different persons for formal and informal addresses. Sinhala diglossia can also be described in terms of informal and formal varieties. Social dances are those performed by guests at banquets, parties or other informal social gatherings. The substrate may survive as a second language for informal conversation. Customary law has some adverse impacts on women in the informal sector. These range from the extremely informal to the highly organized. These demonyms are usually more informal and colloquial. They analyze why adults participate in the informal economy. These places tend to open earlier and have more informal dress. Court litigation was seen as a last resort for cases where informal mediation had failed.