Bangla numbers 10 to 19 (দশ থেকে উনিশ)

The band to brute-force. এগারো (11) is not এক plus দশ in any way you can work out from the parts, and the same goes for most of the rest. The one exception is উনিশ (19), which is the first appearance of the rule that runs through the whole hundred: a nine is built from the ten above it, not from নয়.