A medieval manuscript called L contains all eighteen extant tragedies by the Greek playwright Euripides  Of these, ten called the select plays,  are accompanied in L by ancient commentaries and also appear in other medieval manuscripts; this group includes some of Euripides' best-known works, including the Medea  The other eight, which appear only in L, are called the alphabeticals because they appear in alphabetical order, without commentary
The Electra is one of the alphabeticals
Euripides' Electra does not appear accompanied by a commentary in any extant medieval manuscript