| 055DD |  NULL:: | (  → :: ; )Returns null secondary.
 | 
| 849F2 |  Ob>Seco | ( ob → :: ob ; )Does
 ONEthen <REF>::N. | 
| 849D9 |  ?Ob>Seco | ( ob → :: ob ; )If the object is not a secondary, does
 Ob>Seco. | 
| 84A06 |  2Ob>Seco | ( ob1 ob2 → :: ob1 ob2 ; )Does
 TWOthen <REF>::N. | 
| 83D40 |  ::NEVAL | ( ob1..obn #n → ? )Does <REF>::N then <REF>EVAL.
 |