# Diary, May 1999

``` Sun Mon Tue Wed Thu Fri Sat

1
2   3   4   5   6   7   8
9  10  11  12  13  14  15
16  17  18  19  20  21  22
23  24  25  26  27  28  29
30  31
```

## Friday, May 14, 1999

### Inserting the tube

This morning, I was driving with Andy to my office, when he, while we were waiting for the last traffic light before the highway, made some alarming noises. When I looked back, I saw how he vommited in his famouse explosive manner. But also how the tube was coming out of his mouth.

When the light turned green, I had no choice but to continue. I took the first opportunity to park the car on the side of the highway. I first removed the towel which covered him, luckily, non of his clothes got dirty. And then I pulled out the tube through his nose, and reinserted it. This was the first time, I actually put in the tube. So far, Li-Xia always did it.

### My car on the parking lot

Today is the first time I can see my car from where I am sitting behind the desk, for the simple reason that the parking lot is almost empty. The day after ascension day (which is a national holiday here) is one of these days when many people take off.

### Wooden puzzle

One of my colleages has a wooden puzzle consisting of a string of 27 cubics which can be folded into a 3x3x3 cube. Each pair of cubics can rotate around the centre of the sides with which they are connected. Besides the two end cubics (E), which are only connected with one other cubic, there are cubics that are connected to two other cubics on opposing sides (S), and on adjacent sides (T). His puzzle can be described with the string ESTSTSTSTTTTSTSTTTSTTSTTSE. There is only one way to fold this into a 3x3x3 cube (ignoring different orientations and mirroring).

There are 2480304 different Hamilton paths in the 3x3x3 cubic graph. There are 11487 different puzzles like the one above, which can be folded into a 3x3x3 cube. Of these, 3661 can only be folded in one way, of which 10 are symetric (meaning, that the sequence of cubics is the same, no matter on which side you start). The puzzle, described by the string ETTTTTSTSTSTSTTTTTTTTTTTTE, can be folded in 142 different ways inside the 3x3x3 cube (ignoring orientations and mirroring).

## Saturday, May 15, 1999

### Samples

There are certain crossings in Enschede where often samples of new products are handed out for free. Thing like candy bars, or chips with less fat. Usually, I also try get some of these, but to day I was handed a bag with frozen frence fries. This time it seemed best to return the sample unused.

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