be narrow (in the middle) / be constricted (in the middle) / be compressed (in the middle) / be contracted (in the middle) / be pinched (in the middle) / be constructed (in the middle)

work out / elaborate / contrive

work out / contrive / elaborate

invent / design / come up with *something / think up / think out / devise / contrivance / invention / contrive

work *something out / think hard / rack *one's brains / come up with [an idea] / contrive / think of

make an offering to the Buddha

distinguish / discriminate

classification / discriminate *something from *something / distinction / classifying / make distinctions / classify / discriminating / separating A from B / discrimination / distinguish *something from *something / making distinctions / separate *something from *something / distinguishing

distinguish / discriminate

distinguish / discriminate