BarnPlots: readonly [
"beginner_1",
"beginner_2",
"beginner_3",
"beginner_4",
"intermediate_1",
"intermediate_2",
"intermediate_3",
"intermediate_4",
"advanced_1",
"advanced_2",
"advanced_3",
"advanced_4",
"advanced_5",
"advanced_6",
"advanced_7",
"advanced_8",
"advanced_9",
"advanced_10",
"advanced_11",
"advanced_12",
"expert_1",
"expert_2",
"expert_3",
"expert_4",
] = ...