RobH_en_tn/exo/28/30.md

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the Urim and the Thummim ... the means for making decisions

The second phrase appears to refer to the Urim and Thummim and explain their purpose.

the Urim and the Thummim

It not clear what these are. They were objects, possibly stones, that the priest used to determine somehow the will of God. (See: rc://en/ta/man/translate/translate-unknown)