my @customers = ( [ 'C01', 'Joe', 'NY' ], [ 'C02', 'Frank', 'NY' ], [ 'C03', 'Bill', 'TX' ], [ 'C04', 'Moe', 'MA' ], [ 'C05', 'Sue', 'CA' ] ); my @products = ( [ 'P01', 'hammer', 1.90 ], [ 'P02', 'nail', 0.05 ], [ 'P03', 'pliers', 5.50 ], [ 'P04', 'cutter', 4.00 ] ); my @orders = ( [ 'C02', 'P03', 9 ], [ 'C02', 'P01', 2 ], [ 'C02', 'P02', 200 ], [ 'C05', 'P01', 3 ], [ 'C05', 'P02', 450 ], [ 'C01', 'P04', 4 ], [ 'C01', 'P03', 1 ] );