en_tn_condensed/mrk/09/20.md

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spirit

This refers to the unclean spirit. See how you translated this in Mark 9:17.

convulsion

This is a condition where a person has no control over his body, and his body shakes violently.

Since childhood

"Since he was a small child." It may be helpful to state this as a full sentence. AT: "He has been like this since he was a small child" (See: rc://en/ta/man/translate/figs-ellipsis)

have pity

"have compassion"