Which of the following limits are of the form {{CMD_17}}? {{CMD_18}} {{CMD_19}}{{MATH_20}}{{CMD_21}} {{CMD_22}}{{MATH_23}}{{CMD_24}} {{CMD_25}}{{MATH_26}}{{CMD_27}} {{CMD_28}}{{MATH_29}}{{CMD_30}} {{CMD_31}}{{MATH_32}}{{CMD_33}} {{CMD_34}} {{CMD_35}}