The program loads the block from 10 words and in the random order offers to execute for each of them one of exercises.
The change from one exercise to another depends correct or not you have executed it (for each word).
For the correct answer 3 points will be added to you, for incorrect will be subtracted 2.
The detailed description
the program loads the block from several words (default is 10, the meaning changes in 'Options\Levels');
for each word of the block the set of exercises is carried out;
the exercises are assigned to sequence 6 levels (by a degree of difficulty);
for the correctly executed exercise 3 numbers are added, the incorrect answer is fined (-2 points, the amounts of points can be changed in 'Options\Levels');
the change from one exercise to another possible only on achievement the points limit (for each word).
words from the block replace each other in the random order;
the cycle of study of words in the block repeats so long as all words of the block do not become learned (will collect enough of points);
the word can be excluded from study (is marked learned), pressing of the button (-), thus the new word will added in the block for study.