Sd understands simple things:
```            1B^   2BV   4G^   3GV

1G^   2GV   4B^   3BV

BOYS hinge

1B>
4G^   3GV
2B<

4B>
1G^   2GV
3B<
```

and:

```                3G>  4B>  4G>
3B^               1BV
2G<  2B<  1G<

GIRLS hinge

4B>
3B^  2G^  3GV       1G^  4GV  1BV
2B<
```

Sd understands moderately complex things:

```                    4GV  3B^
3GV 4B^          2BV 1G^
1BV  2G^

BOYS IN YOUR DISTORTED WAVE swing thru

4GV  4B^
3GV 1B^          3BV 1G^
2BV  2G^
```

and:

```                  3BV
2BV   3G^   4G^
2GV   1GV   4B^
1B^

swing thru

3BV   2B^   4GV   3G^

1GV   2G^   4BV   1B^
```

and:

```                           3B>
4G^   3GV
2B<

4B>
1G^   2GV
1B<

BOYS START, swing the fractions

1G^   2BV   2G^   3BV

1B^   4GV   4B^   3GV
```

and:

```              2B<  3B<
3GV 2G^          4GV 1G^
1B>  4B>

IGNORE THE SIDE GIRLS, triangle circulate

1B<  1G<
2BV 2G^          4GV 4B^
3G>  3B>
```

and:

```                      4B>
1G<
3B^ 4GV         2G^ 1BV
3G>
2B<

GIRLS flip the diamond

4B>

3B^  1GV  4G^  2GV  3G^  1BV

2B<
```

and even:

```                      4B>
1G<
3B^ 4GV         2G^ 1BV
3G>
2B<

4 TIMES, CENTER DIAMOND, flip the diamond

1G>
4G<
3B^ 4BV         2B^ 1BV
2G>
3G<
```

And of course Sd understands extremely complex things:

```            4B>   4G>   1B>   1G>

3G<   3B<   2G<   2B<

INVERT SNAG, INVERT deuces wild

1B>  4G>
3G^ 4BV          2B^ 1GV
2G<  3B<
```

and:

```            4B>   4G>   1B>   1G>

3G<   3B<   2G<   2B<

RANDOM ONCE REMOVED, CENTRAL, lead the way

1BV   4BV   1GV   4GV

2G^   3G^   2B^   3B^
```

and:

```         4B>                    2G<
1B^  3GV  1G^  3BV
4G>                    2B<

ONCE REMOVED single wheel

1BV            3G^
4G<     4B<    2B>     2G>
1GV            3B^
```