The MPM of a current block may include intraPredModeL, intraPredModeA, and a default mode. The MPM of a current block may additionally include at least one of a mode derived by subtracting 1 from intraPredModeL, a mode derived by adding 1 to intraPredModeL, a mode derived by subtracting 2 from intraPredModeL or a mode derived by adding 2 to intraPredModeL. When the mode derived by subtracting or adding 1 from or to intraPredModeL is the same as intraPredModeA, it may be excluded from a MPM. In this case, the mode derived by subtracting or adding 2 from or to intraPredModeL may be added/included as a MPM.
An index may be assigned to the MPM based on a predetermined priority. For example, an index may be assigned to each MPM as in the following Table 3. But, a priority of the present disclosure is not limited to Table 3 and a position of a MPM in a candidate mode list may be different from Table 3.
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