risk denominators 1 verbete role 1 verbete rollover 1 verbete roughness 1 verbete sales growth 1 verbete salmabalga 1 verbete sample size 1 verbete sampling 1 verbete sampling frequency 1 verbete sanitation 1 verbete scaffolding 2 verbetes scalp 1 verbete SVET (Scanning Vibrating Electrode Technique) 1 verbete scope 1 verbete second language 1 verbete second language learning 1 verbete secondary qualities 1 verbete self-assessment 1 verbete self-belief 1 verbete self-directed language learning 1 verbete