instruction given in both L1 and FL (a language that is neither a learner´s mother language nor an official language used in the country)

instruction provided in L2 and FL

instruction that combines L1 (a mother language; the first language, a native language) with L2 (a second language; the language of instruction that is not a learner´s mother language but is used as an official, state language in the country)

instruction given in two different foreign languages that are neither a learner´s mother language nor an official language used in the country