[If] someone plants a row of five grapevines — Beis Shammai say: [It is] a vineyard. But Beis Hillel say: It is not a vineyard until there are two rows there. Therefore, [if] someone plants [within] the four cubits of a vineyard — Beis Shammai say: He has condemned one row. But Beis Hillel say: He has condemned two rows.