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Since K is the point where the angle bisectors of <JKI and <MKI intersect, we know that angles JKM, MKI, and JKN are all bisected.
First, we find the measurement of <JKM:
<JKM = 1/2 * <JKI
<JKM = 1/2 * 56
<JKM = 28 degrees
Next, we find the measurement of <MKI:
<MKI = 1/2 * <JKM
<MKI = 1/2 * 28
<MKI = 14 degrees
Finally, we find the measurement of <NKI:
<NKI = 1/2 * <MKI
<NKI = 1/2 * 14
<NKI = 7 degrees
Therefore, the measurement of <NKI is 7 degrees.