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Terraform accessing data from maps and list in the variable

resource "aws_instance" "myec2" {
ami = "ami-082b5a644766e0e6f"
instance_type = <INSTANCE_TYPE>
}
variable "list" {
type = list
default = ["t2.nano", "t2.micro", "t2.medium"]
}
variable "types" {
type = map
default = {
dev = "t2.nano",
int = "t2.micro",
prod = "t2.medium"
},
}
resource "aws_instance" "myec2" {
ami = "ami-082b5a644766e0e6f"
instance_type = var.list[1]
}
resource "aws_instance" "myec2" {
ami = "ami-082b5a644766e0e6f"
instance_type = var.types["us-east-1"]
}

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