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  TestTriangleSolution
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1) Enter an arbitrary triangle as usual

For example:

D 4 A 5 B 60 C' E

2) Save the results: press E'

3) Start the test suite with SBR x#t.
   This will do the following:

123 D' R/S SBR = R/S
124 D' R/S SBR = R/S
125 D' R/S SBR = R/S
126 D' R/S SBR = R/S
134 D' R/S SBR = R/S
135 D' R/S SBR = R/S
136 D' R/S SBR = R/S
234 D' R/S SBR = R/S
235 D' R/S SBR = R/S
236 D' R/S SBR = R/S
451 D' R/S SBR = R/S
452 D' R/S SBR = R/S
453 D' R/S SBR = R/S
461 D' R/S SBR = R/S
462 D' R/S SBR = R/S
463 D' R/S SBR = R/S
561 D' R/S SBR = R/S
562 D' R/S SBR = R/S
563 D' R/S SBR = R/S

However, only enter SBR = if there is no blinking 9.9999999 99 (= error).

If a "2" is blinking in the display after pressing D', this means that
there may be 2 solutions. Press CLR before entering SBR = in that case,
then press E again, and SBR = again. One of the two SBR = calls (or both)
should succeed, whereas the other may result in a blinking 9.9999999 99
(but not both).