How many values of powershell (cmdlet) are valid when unix shell is env, export, set, setenv?
CREATE TABLE table_72550 (
    "PowerShell (Cmdlet)" text,
    "PowerShell (Alias)" text,
    "CMD.EXE / COMMAND.COM" text,
    "Unix shell" text,
    "Description" text
)
SELECT COUNT("PowerShell (Cmdlet)") FROM table_72550 WHERE "Unix shell" = 'env, export, set, setenv'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many values of powershell (cmdlet) are valid when unix shell is env, export, set, setenv? ### Input: CREATE TABLE table_72550 (
    "PowerShell (Cmdlet)" text,
    "PowerShell (Alias)" text,
    "CMD.EXE / COMMAND.COM" text,
    "Unix shell" text,
    "Description" text
) ### Response: SELECT COUNT("PowerShell (Cmdlet)") FROM table_72550 WHERE "Unix shell" = 'env, export, set, setenv'