You want to translate a text from a source language to a target language. The text is a sequence of words which you translate one by one using a dictionary, replacing each word in the source text with one of its possible translations. In order to find the most appropriate translation, you have explored a few books in the target language, from which you have calculated expected frequency values for all ordered pairs of consecutive words. To estimate the correctness of your translation, you calculate the sum of the expected frequencies of all the consecutive pairs of words in the translation. This sum is called the fidelity of the translation.
The source text is given as a String, each element of which contains a non-empty single-space separated list of words. The entire String should be considered a single text, so the last word of an element is considered to be adjacent to the first word of the next element.
The dictionary is given as a String, each element of which is formatted as "word : tr1 tr2 ... trn", where word is a word in the source language, and "tr1 tr2 ... trn" is a single-space separated list of n possible translations of that word in the target language (dots and quotes for clarity only).
The expected frequencies are given as a String containing elements of the form "WORD1 WORD2 FREQUENCY" (quotes for clarity only), where FREQUENCY is the expected frequency of WORD1 followed immediately by WORD2. If the frequency of some pair of words is not given in the input, it is assumed to be zero.
Return the maximum possible fidelity of the translation.