A get command that uses the provided default in case of failure, e.g. get.or_use accounts[r0] r1 into r2;.
Gets the value stored at operand in mapping and stores the result in destination.
If the key is not present, default is stored in destination.
A random-number generator command, e.g. rand.chacha into r1 as field; or
rand.chacha r0 into r1 as field;, with the latter including an optional additional seed(s).