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Note that Isabela, Basilan, despite being a part of the province of Basilan, is not a part of the ARMM.
Note that in Isabela, Basilan, although a part of this region, the voters elect their representative via Basilan's legislative district.
However, by opting to remain within Region IX, Isabela City's residents are not eligible to elect and be elected to regional offices of the expanded Autonomous Region in Muslim Mindanao (ARMM) which now includes the rest of Basilan.