diff --git a/TaskA49/description.txt b/TaskA49/description.txt
index 6886df7..4f973ef 100644
--- a/TaskA49/description.txt
+++ b/TaskA49/description.txt
@@ -7,7 +7,9 @@ http://poleval2020.nlp.ipipan.waw.pl/challenge/poleval-diachronic-morpho
 
 Also, apart from submitting a solution you're expected to report any
 problems with the web site (including incorrect English, unclear
-instructions, software errors).
+instructions, software errors). Please add issues at
+https://git.wmi.amu.edu.pl/filipg/gonito with label "poleval".
+(first check whether you're the first to submit a problem).
 
 For an account there, please contact Filip Graliński, but do it only
 when you're sure you'll take part in it — the dataset and instructions
diff --git a/TaskB00/description.txt b/TaskB00/description.txt
index d84cb21..9660543 100644
--- a/TaskB00/description.txt
+++ b/TaskB00/description.txt
@@ -18,5 +18,5 @@ NOTE: Task only for students whose student index number ("numer
 indeksu") is divisable by 3.
 
 POINTS: 8
-DEADLINE: 2019-12-09 18:45
+DEADLINE: 2019-12-12 18:45
 REMAINDER: 0/3
diff --git a/TaskB01/description.txt b/TaskB01/description.txt
index 7e13d5c..23db8c8 100644
--- a/TaskB01/description.txt
+++ b/TaskB01/description.txt
@@ -4,8 +4,8 @@ Deterministic automaton II
 Read a description of a finite-state automaton in the AT&T format
 (without weights) from the standard input. Then, read strings from the
 file whose name was given as the first argument. If a string is
-accepted by the automated, write YES, a space and the string on the
-standard output, otherwise — write NO, a space and the string.
+accepted by the automated, write TRUE, a space and the string on the
+standard output, otherwise — write FALSE, a space and the string.
 
 If there is a non-determinism in the automaton, the first transition should be chosen.
 
@@ -16,5 +16,5 @@ NOTE: Task only for students whose student index number ("numer
 indeksu") is divisable by 3 with a remainder of 1
 
 POINTS: 8
-DEADLINE: 2019-12-09 18:45
+DEADLINE: 2019-12-12 18:45
 REMAINDER: 1/3
diff --git a/TaskB02/description.txt b/TaskB02/description.txt
index 5c1e651..a067ca1 100644
--- a/TaskB02/description.txt
+++ b/TaskB02/description.txt
@@ -24,5 +24,5 @@ NOTE: Task only for students whose student index number ("numer
 indeksu") is divisable by 3 with a remainder of 2
 
 POINTS: 8
-DEADLINE: 2019-12-09 18:45
+DEADLINE: 2019-12-12 18:45
 REMAINDER: 2/3
diff --git a/TaskB04/description.txt b/TaskB04/description.txt
index 605d73a..958cffd 100644
--- a/TaskB04/description.txt
+++ b/TaskB04/description.txt
@@ -7,8 +7,9 @@ cycles. The automaton alphabet is the set of Polish lower-case letters
 (English letters plus: ą, ć, ę, ł, ń, ó, ś, ź and ż).
 
 Your program should print, on standard output, all the paths of the
-automaton in alphabetical order. "Print a path" means print a text
-line containing all subsequent characters.
+automaton in alphabetical order (to be precise: order induced by byte
+codes of strings, not according to the standard Polish order). "Print
+a path" means print a text line containing all subsequent characters.
 
 The program does not have to check whether the automaton is correct
 and whether it is deterministic and does not contain cycles.
@@ -21,6 +22,8 @@ than sum) is taken.
 NOTE 2. Task only for students whose student index number ("numer
 indeksu") is divisible by 3 with a remainder of 1
 
+NOTE 3. You can add `LANG=C sort` to your Bash wrapper for the write sort.
+
 POINTS: 14
 DEADLINE: 2019-12-16 23:59
 REMAINDER: 1/3
diff --git a/TaskB06/description.txt b/TaskB06/description.txt
index a556e1c..6212309 100644
--- a/TaskB06/description.txt
+++ b/TaskB06/description.txt
@@ -11,4 +11,4 @@ NOTE. In section B for points for your tasks, the maximum (rather
 than sum) is taken.
 
 POINTS: 18
-DEADLINE: 2019-01-10 23:59
+DEADLINE: 2020-01-10 23:59
diff --git a/TaskX05/Makefile b/TaskX05/Makefile
new file mode 100644
index 0000000..1e04198
--- /dev/null
+++ b/TaskX05/Makefile
@@ -0,0 +1,9 @@
+
+# .far to specjalny format do przechowywania spakowanych transduktorów
+
+BINARIES += TaskX05/legiatolech.far
+
+TaskX05/run: TaskX05/legiatolech.far
+
+TaskX05/legiatolech.far: TaskX05/legiatolech.grm
+	LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:/usr/lib/fst" thraxcompiler --input_grammar=$< --output_far=$@
diff --git a/TaskX05/description.txt b/TaskX05/description.txt
new file mode 100644
index 0000000..e9d0d05
--- /dev/null
+++ b/TaskX05/description.txt
@@ -0,0 +1,9 @@
+Write a Thrax grammar which replaces all occurrences of Polish
+inflected forms of the word "Legia" ("Legia", "Legią", "Legię",
+"Legii") into the corresponding forms of the word "Lech" ("Lech",
+"Lechem", "Lecha", "Lecha", respectively).
+
+The task has a solution already, do not solve it!
+
+POINTS: 0
+DEADLINE: 2020-01-30 23:00
diff --git a/TaskX05/legiatolech.grm b/TaskX05/legiatolech.grm
new file mode 100644
index 0000000..e0181b5
--- /dev/null
+++ b/TaskX05/legiatolech.grm
@@ -0,0 +1,42 @@
+
+# zamiana końcówek, "i"/"ę" zgrupowane, bo zamieniamy na wspólną końcówkę
+suffixes = ("a" : "") | ("i" | "ę" : "a") | ("ą" : "em");
+
+# zamiana rdzenia
+legia_to_lech_core = "Legi" : "Lech";
+
+legia_to_lech = legia_to_lech_core suffixes;
+
+# Wszystkie możliwe znaki, niestety nie ma (?) prostszego sposobu.
+# Zauważmy, że polskie znaki diakrytyczne będą reprezentowane
+# tak naprawdę jako dwuznaki, nie stanowi to jednak problemu.
+allChars = Optimize[
+  "[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]" |  "[32]" |  "[33]" |  "[34]" |  "[35]" |  "[36]" |  "[37]" |  "[38]" |  "[39]" |  "[40]" |
+ "[41]" |  "[42]" |  "[43]" |  "[44]" |  "[45]" |  "[46]" |  "[47]" |  "[48]" |  "[49]" |  "[50]" |
+ "[51]" |  "[52]" |  "[53]" |  "[54]" |  "[55]" |  "[56]" |  "[57]" |  "[58]" |  "[59]" |  "[60]" |
+ "[61]" |  "[62]" |  "[63]" |  "[64]" |  "[65]" |  "[66]" |  "[67]" |  "[68]" |  "[69]" |  "[70]" |
+ "[71]" |  "[72]" |  "[73]" |  "[74]" |  "[75]" |  "[76]" |  "[77]" |  "[78]" |  "[79]" |  "[80]" |
+ "[81]" |  "[82]" |  "[83]" |  "[84]" |  "[85]" |  "[86]" |  "[87]" |  "[88]" |  "[89]" |  "[90]" |
+ "[91]" |  "[92]" |  "[93]" |  "[94]" |  "[95]" |  "[96]" |  "[97]" |  "[98]" |  "[99]" | "[100]" |
+"[101]" | "[102]" | "[103]" | "[104]" | "[105]" | "[106]" | "[107]" | "[108]" | "[109]" | "[110]" |
+"[111]" | "[112]" | "[113]" | "[114]" | "[115]" | "[116]" | "[117]" | "[118]" | "[119]" | "[120]" |
+"[121]" | "[122]" | "[123]" | "[124]" | "[125]" | "[126]" | "[127]" | "[128]" | "[129]" | "[130]" |
+"[131]" | "[132]" | "[133]" | "[134]" | "[135]" | "[136]" | "[137]" | "[138]" | "[139]" | "[140]" |
+"[141]" | "[142]" | "[143]" | "[144]" | "[145]" | "[146]" | "[147]" | "[148]" | "[149]" | "[150]" |
+"[151]" | "[152]" | "[153]" | "[154]" | "[155]" | "[156]" | "[157]" | "[158]" | "[159]" | "[160]" |
+"[161]" | "[162]" | "[163]" | "[164]" | "[165]" | "[166]" | "[167]" | "[168]" | "[169]" | "[170]" |
+"[171]" | "[172]" | "[173]" | "[174]" | "[175]" | "[176]" | "[177]" | "[178]" | "[179]" | "[180]" |
+"[181]" | "[182]" | "[183]" | "[184]" | "[185]" | "[186]" | "[187]" | "[188]" | "[189]" | "[190]" |
+"[191]" | "[192]" | "[193]" | "[194]" | "[195]" | "[196]" | "[197]" | "[198]" | "[199]" | "[200]" |
+"[201]" | "[202]" | "[203]" | "[204]" | "[205]" | "[206]" | "[207]" | "[208]" | "[209]" | "[210]" |
+"[211]" | "[212]" | "[213]" | "[214]" | "[215]" | "[216]" | "[217]" | "[218]" | "[219]" | "[220]" |
+"[221]" | "[222]" | "[223]" | "[224]" | "[225]" | "[226]" | "[227]" | "[228]" | "[229]" | "[230]" |
+"[231]" | "[232]" | "[233]" | "[234]" | "[235]" | "[236]" | "[237]" | "[238]" | "[239]" | "[240]" |
+"[241]" | "[242]" | "[243]" | "[244]" | "[245]" | "[246]" | "[247]" | "[248]" | "[249]" | "[250]" |
+"[251]" | "[252]" | "[253]" | "[254]" | "[255]"
+];
+
+export PROCESS = Optimize[CDRewrite[legia_to_lech, "", "", allChars*]];
diff --git a/TaskX05/run b/TaskX05/run
new file mode 100755
index 0000000..96b1df6
--- /dev/null
+++ b/TaskX05/run
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/lib/fst" thraxrewrite-tester --far=TaskX05/legiatolech.far --rules=PROCESS
diff --git a/TaskX05/test.exp b/TaskX05/test.exp
new file mode 100644
index 0000000..c9798c5
--- /dev/null
+++ b/TaskX05/test.exp
@@ -0,0 +1,6 @@
+Input string: Output string: Lech Warszawa
+Input string: Output string: Górnik gra z Lechem
+Input string: Output string: Lech Lecha Lecha Lechem
+Input string: Output string: Lechxxxxx
+Input string: Output string: tu nic nie ma do zamiany
+Input string: 
\ No newline at end of file
diff --git a/TaskX05/test.in b/TaskX05/test.in
new file mode 100644
index 0000000..66ee623
--- /dev/null
+++ b/TaskX05/test.in
@@ -0,0 +1,5 @@
+Legia Warszawa
+Górnik gra z Legią
+Legia Legii Legię Legią
+Legiaxxxxx
+tu nic nie ma do zamiany
diff --git a/TaskX06/description.txt b/TaskX06/description.txt
new file mode 100644
index 0000000..79b046a
--- /dev/null
+++ b/TaskX06/description.txt
@@ -0,0 +1,8 @@
+Write a Thrax grammar which replaces all 0s to 1s and 1s to 0s (other
+digits should not be changed).
+
+You can assume that only string composed of digits are given on the
+input.
+
+POINTS: 1
+DEADLINE: 2019-12-13 23:59
diff --git a/TaskX06/test.exp b/TaskX06/test.exp
new file mode 100644
index 0000000..aadf164
--- /dev/null
+++ b/TaskX06/test.exp
@@ -0,0 +1,6 @@
+Input string: Output string: 0023410
+Input string: Output string: 0101010
+Input string: Output string: 9999999
+Input string: Output string: 888088888888888
+Input string: Output string: 111
+Input string: 
\ No newline at end of file
diff --git a/TaskX06/test.in b/TaskX06/test.in
new file mode 100644
index 0000000..aa6a508
--- /dev/null
+++ b/TaskX06/test.in
@@ -0,0 +1,5 @@
+1123401
+1010101
+9999999
+888188888888888
+000
diff --git a/blend.sh b/blend.sh
index baa9933..fbb6c8f 100755
--- a/blend.sh
+++ b/blend.sh
@@ -19,7 +19,7 @@ cp "${PREFIX}/count-points.pl" arena/
 cp "${PREFIX}/overrides.txt" arena/
 cp "${PREFIX}/Makefile" arena/
 
-for TX in X01 X02 X03 X04 B00 B01 B02 B03 B04 B05 B06 E01 E02 E03 E04 # X05 X06 X07 X08 X09 X10 B03 B04 X10
+for TX in X01 X02 X03 X04 X05 X06 B00 B01 B02 B03 B04 B05 B06 E01 E02 E03 E04 # X05 X06 X07 X08 X09 X10 B03 B04 X10
 do
     mkdir -p arena/Task$TX
 done
diff --git a/overrides.txt b/overrides.txt
index e69de29..a3a14f7 100644
--- a/overrides.txt
+++ b/overrides.txt
@@ -0,0 +1 @@
+434739 A44 4 manually