Latin bocks

One set contains 20 blocks (edges 4,6cm), according to the repetition pattern:

• consonants… x 2
• vowels `e, i, o, u`… x 4
• letter `a`… x 7
• numbers `1-9`… x 3
• number `0`… x 4
• signs `+` and `-`… x 2
• sign `=`… x 4