Create a function that returns true if smaller arrays can concatenate to form the target array and false otherwise.

Examples

can_concatenate([[1, 2, 3, 4], [5, 6], [7]], [1, 2, 3, 4, 5, 6, 7]) ➞ true

can_concatenate([[2, 1, 3], [5, 4, 7, 6]], [7, 6, 5, 4, 3, 2, 1]) ➞ true

can_concatenate([[2, 1, 3], [5, 4, 7, 6, 7]], [1, 2, 3, 4, 5, 6, 7]) ➞ false
# Duplicate 7s not found in target array.

can_concatenate([[2, 1, 3], [5, 4, 7]], [1, 2, 3, 4, 5, 6, 7]) ➞ false
# Missing 6 from target array.

Notes

• Arrays do not have to be sorted (see example #2).
• Arrays should concatenate to create the final array exactly (see examples #3 and #4).