IF(x0, THEN(a, b)); IF(x1, THEN(a, b), THEN(c, d)); item = IF(x1, a, THEN(c, c, b)); IF( x1, a, item ); IF(x1, THEN(a, b)).ELSE(THEN(c, d)); item = IF(x1, a, THEN(c, c, b)); IF(x1, THEN(a, b)).ELSE(item); IF(x1, THEN(a, b)).ELIF(x0, THEN(c, c)).ELSE(d); IF(x1, a).ELIF(x1, b) .ELIF(x1, c) .ELIF(x1, d) .ELSE(THEN(d, b, a));