diff --git a/sql/01-trim.sql b/sql/01-trim.sql
new file mode 100644
index 0000000..d337204
--- /dev/null
+++ b/sql/01-trim.sql
@@ -0,0 +1,72 @@
+select datetime("now","localtime"), "start";
+
+-- pragma journal_mode = WAL;
+pragma journal_mode = OFF;
+pragma synchronous = OFF;
+pragma mmap_size = 30000000000;
+pragma cache_size = -1000000;
+pragma locking_mode = EXCLUSIVE;
+pragma threads = 4;
+pragma soft_heap_limit = 7000000000;
+
+
+
+-- ##############
+
+select datetime("now","localtime"), "delete one";
+
+delete
+from
+    one_gram_records
+where
+    word regexp "[0-9]+"
+    or
+    score < 10000
+;
+
+
+select datetime("now","localtime"), "delete two";
+
+delete
+from
+    two_gram_records
+where
+    score < 10000
+;
+
+
+select datetime("now","localtime"), "delete three";
+
+delete
+from
+    three_gram_records
+where
+    score < 10000
+;
+
+
+select datetime("now","localtime"), "delete four";
+delete
+from
+    four_gram_records
+where
+    score < 10000
+;
+
+
+select datetime("now","localtime"), "delete five";
+delete
+from
+    five_gram_records
+where
+    score < 10000
+;
+
+
+-- ##############
+
+select datetime("now","localtime"), "vacuum";
+vacuum;
+
+pragma optimize;
+select datetime("now","localtime"), "done";
diff --git a/sql/02-build.sql b/sql/02-build.sql
new file mode 100644
index 0000000..53f481a
--- /dev/null
+++ b/sql/02-build.sql
@@ -0,0 +1,287 @@
+select datetime("now","localtime"), "start";
+
+attach database "data.sqlite" as data;
+
+pragma journal_mode = WAL;
+pragma synchronous = OFF;
+pragma mmap_size = 30000000000;
+pragma cache_size = -1000000;
+pragma locking_mode = EXCLUSIVE;
+pragma threads = 8;
+pragma soft_heap_limit = 7000000000;
+
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "idx_one_gram_records_word";
+create index if not exists data.idx_one_gram_records_word on one_gram_records (word);
+
+select datetime("now","localtime"), "idx_one_gram_records_score";
+create index if not exists data.idx_one_gram_records_score on one_gram_records (score);
+
+select datetime("now","localtime"), "idx_two_gram_records_score";
+create index if not exists data.idx_two_gram_records_score on two_gram_records (score);
+
+select datetime("now","localtime"), "idx_three_gram_records_score";
+create index if not exists data.idx_three_gram_records_score on three_gram_records (score);
+
+select datetime("now","localtime"), "idx_four_gram_records_score";
+create index if not exists data.idx_four_gram_records_score on four_gram_records (score);
+
+select datetime("now","localtime"), "idx_five_gram_records_score";
+create index if not exists data.idx_five_gram_records_score on five_gram_records (score);
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "analyze";
+analyze;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "create table one_grams";
+create table one_grams (
+    id      integer not null primary key,
+    word    text    not null
+);
+
+select datetime("now","localtime"), "insert into one_grams";
+insert into
+    one_grams (word)
+select
+    word
+from
+    one_gram_records
+where
+    word regexp "^[^0-9]+$"
+order by score desc, word
+;
+
+select datetime("now","localtime"), "create index one_grams";
+create index idx_one_grams_word on one_grams (word);
+
+select datetime("now","localtime"), "analyze main";
+analyze main;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "create table two_grams";
+create table two_grams (
+    id      integer not null primary key,
+    prefix  integer not null,
+    suffix  integer not null,
+    foreign key (prefix) references one_grams (id)
+        on delete cascade deferrable initially deferred,
+    foreign key (suffix) references one_grams (id)
+        on delete cascade deferrable initially deferred
+);
+
+select datetime("now","localtime"), "insert into two_grams";
+insert into
+    two_grams (prefix, suffix)
+select
+    newone1.id, newone2.id
+from
+    two_gram_records as r
+join one_gram_records as oldone1
+    on oldone1.id = r.word1
+join one_gram_records as oldone2
+    on oldone2.id = r.word2
+join one_grams as newone1
+    on newone1.word = oldone1.word
+join one_grams as newone2
+    on newone2.word = oldone2.word
+order by r.score desc
+;
+
+select datetime("now","localtime"), "create index two_grams suffix";
+create index idx_two_grams_suffix on two_grams (suffix);
+
+select datetime("now","localtime"), "create index two_grams";
+create unique index idx_two_grams_words on two_grams (prefix, suffix);
+
+
+select datetime("now","localtime"), "analyze main";
+analyze main;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "create table three_grams";
+create table three_grams (
+    id      integer not null primary key,
+    prefix  integer not null,
+    suffix  integer not null,
+    foreign key (prefix) references two_grams (id)
+        on delete cascade deferrable initially deferred,
+    foreign key (suffix) references one_grams (id)
+        on delete cascade deferrable initially deferred
+);
+
+select datetime("now","localtime"), "insert into three_grams";
+insert into
+    three_grams (prefix, suffix)
+select
+    two.id, newone3.id
+from
+    three_gram_records as r
+join one_gram_records as oldone1
+    on oldone1.id = r.word1
+join one_gram_records as oldone2
+    on oldone2.id = r.word2
+join one_gram_records as oldone3
+    on oldone3.id = r.word3
+join one_grams as newone1
+    on newone1.word = oldone1.word
+join one_grams as newone2
+    on newone2.word = oldone2.word
+join one_grams as newone3
+    on newone3.word = oldone3.word
+join two_grams as two
+    on two.prefix = newone1.id and two.suffix = newone2.id
+order by r.score desc
+;
+
+select datetime("now","localtime"), "create index three_grams suffix";
+create index idx_three_grams_suffix on three_grams (suffix);
+
+select datetime("now","localtime"), "create index three_grams";
+create unique index idx_three_grams_words on three_grams (prefix, suffix);
+
+
+select datetime("now","localtime"), "analyze main";
+analyze main;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "create table four_grams";
+create table four_grams (
+    id      integer not null primary key,
+    prefix  integer not null,
+    suffix  integer not null,
+    foreign key (prefix) references three_grams (id)
+        on delete cascade deferrable initially deferred,
+    foreign key (suffix) references one_grams (id)
+        on delete cascade deferrable initially deferred
+);
+
+select datetime("now","localtime"), "insert into four_grams";
+insert into
+    four_grams (prefix, suffix)
+select
+    three.id, newone4.id
+from
+    four_gram_records as r
+join one_gram_records as oldone1
+    on oldone1.id = r.word1
+join one_gram_records as oldone2
+    on oldone2.id = r.word2
+join one_gram_records as oldone3
+    on oldone3.id = r.word3
+join one_gram_records as oldone4
+    on oldone4.id = r.word4
+join one_grams as newone1
+    on newone1.word = oldone1.word
+join one_grams as newone2
+    on newone2.word = oldone2.word
+join one_grams as newone3
+    on newone3.word = oldone3.word
+join one_grams as newone4
+    on newone4.word = oldone4.word
+join two_grams as two
+    on two.prefix = newone1.id and two.suffix = newone2.id
+join three_grams as three
+    on three.prefix = two.id and three.suffix = newone3.id
+order by r.score desc
+;
+
+select datetime("now","localtime"), "create index four_grams suffix";
+create index idx_four_grams_suffix on four_grams (suffix);
+
+select datetime("now","localtime"), "create index four_grams";
+create unique index idx_four_grams_words on four_grams (prefix, suffix);
+
+
+select datetime("now","localtime"), "analyze main";
+analyze main;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "create table five_grams";
+create table five_grams (
+    id      integer not null primary key,
+    prefix  integer not null,
+    suffix  integer not null,
+    foreign key (prefix) references four_grams (id)
+        on delete cascade deferrable initially deferred,
+    foreign key (suffix) references one_grams (id)
+        on delete cascade deferrable initially deferred
+);
+
+select datetime("now","localtime"), "insert into five_grams";
+insert into
+    five_grams (prefix, suffix)
+select
+    four.id, newone5.id
+from
+    five_gram_records as r
+join one_gram_records as oldone1
+    on oldone1.id = r.word1
+join one_gram_records as oldone2
+    on oldone2.id = r.word2
+join one_gram_records as oldone3
+    on oldone3.id = r.word3
+join one_gram_records as oldone4
+    on oldone4.id = r.word4
+join one_gram_records as oldone5
+    on oldone5.id = r.word5
+join one_grams as newone1
+    on newone1.word = oldone1.word
+join one_grams as newone2
+    on newone2.word = oldone2.word
+join one_grams as newone3
+    on newone3.word = oldone3.word
+join one_grams as newone4
+    on newone4.word = oldone4.word
+join one_grams as newone5
+    on newone5.word = oldone5.word
+join two_grams as two
+    on two.prefix = newone1.id and two.suffix = newone2.id
+join three_grams as three
+    on three.prefix = two.id and three.suffix = newone3.id
+join four_grams as four
+    on four.prefix = three.id and four.suffix = newone4.id
+order by r.score desc
+;
+
+select datetime("now","localtime"), "create index five_grams suffix";
+create index idx_five_grams_suffix on five_grams (suffix);
+
+select datetime("now","localtime"), "create index five_grams";
+create unique index idx_five_grams_words on five_grams (prefix, suffix);
+
+
+select datetime("now","localtime"), "analyze main";
+analyze main;
+
+
+-- ##############
+
+
+select datetime("now","localtime"), "vacuum";
+vacuum main;
+
+pragma optimize;
+select datetime("now","localtime"), "done";