अन्तःस्थवर्णानां क्रमः कः ?
English: Antahstha varnas order is ya va ra la, also called semivowels, pronounced with slight contact between articulators. Hindi: अन्तःस्थ वर्णों का क्रम य् व् र् ल् है, इन्हें अर्धस्वर भी कहा जाता है।
Ref: NCERT Sanskrit Class X Chapter Varnavichara explains swara vyanjana uchcharana sthana prayatna grammar rules clearly.