@HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES: Return cluster values grouped by graphemes into monotone order. @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS: Return cluster values grouped into monotone order. @HB_BUFFER_CLUSTER_LEVEL_CHARACTERS: Don't group cluster values. @HB_BUFFER_CLUSTER_LEVEL_DEFAULT: Default cluster level, equal to @HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES.
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