Test: linear_from_data_rows ▛▀▀▀▀▀▀▀▀▀▀▜ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▌ ▒ ▐ ▙▄▄▄▄▄▄▄▄▄▄▟