Return a list of count elements from the container
sampled uniformly at random without replacement.
| sample-unique-elements < array > < cl-variates:basic-random-number-generator > < integer > |
| sample-unique-elements < > < cl-variates:basic-random-number-generator > < integer > |
| sample-unique-elements < list > < cl-variates:basic-random-number-generator > < integer > |
| sample-unique-elements < t > < cl-variates:random-number-generation-mixin > < integer > |