Learner 1 (L1) - is a 5-year old – pre-school bilingual (90% German, 10% Slovak) daughter of the main author of this article three HMPL-C2 exercise 1 (E1) sessions were executed on days 1, 3 and 5 of the study each HMPL-C2-E1 session consisted of human-testing phase followed by a mutual human-machine learning phase in each phase, sequences consisted of 5 repetitions of syllables started with occlusive labial consonant M or B and followed by the vowel A, E, I, O or U, thus yielding sequences from “MA MA MA MA MA” to “BU BU BU BU BU" speech recordings collected during the learning phase subsequently provided input for the acoustic-model fine-tuning process